how to tell if thermostat is bad in car

The first and potentially most alarming symptom will be the temperature gauge reading high into the redwithin the first 15 minutes of your vehicle engine running. If one hose is cold and the other hot, this is a good indication your thermostat is stuck closed. If you've ever pulled clothes out only to find that they were still damp, or found that your dryer was not shutting off at the timer, the thermostat may be the first thing to troubleshoot. Same for the thermostat housing. If you car engine is running hot and you are watching that temperature gauge climb higher and higher, especially while sitting in traffic, you know something is wrong. This operation prevents the engine from overheating. Method 1: Mixed coolant types. I think the thermostat is doing its job. If you make changes at the thermostat and get no response whatsoever from your furnace, air conditioner, or heat pump, it could mean the thermostat is bad. Different car manufacturers install the coolant temperature sensor differently. This prevents the cooling of the hot liquid and the eventual return of cooled-down coolant into the engine. The mating surface must be smooth and clean. If you start noticing issues with the thermostat check the coolant levels. Remove the thermostat from the thermostat housing. By 200 it should be wide open. The thermostat usually has the opening temperature on it. You can check that with a DVOM (OHM METER). Easiest to remove and check thermostat. Step 3: Open the radiator cap. Instead, you might have a failed thermostat, which opens and closes circuits in the cooling system as the engine heats up. Your car thermostat is designed to open up once your car’s engine reaches its full operating temperature; allowing coolant to flow into the radiator. Look through the filling of the radiator neck to see if the coolant is flowing. As always he’s a pleasure to work with. You can also use a digital multimeter to test the coolant for corrosion. However, it is usually in close proximity of the thermostat of the cooling system, or inside it. To actually test the thermostat, remove it from the thermostat housing in your car engine. A+ job and would recommend Steve any day of the week. With the cap off, start the engine and let it idle at 1500 RPMs to warm up. So if it's not going over 200 you're fine. A thermostat fails "open" this way if the spring breaks or gunk in the system prevents the valve from fully closing. On the other hand, if your CT is stuck closed, your machine will most likely overheat. To actually test the thermostat, remove it from the thermostat housing in your car engine. . The housing will be at the end of the hose, and the thermostat is within the housing. Both can fail without actually leaking, especially the thermostat causing the coolant to boil over. Insightful and quick, yet thorough. Too much water being present in the system can cause rust. Not only should you have your thermostat checked, but be sure to also have your coolant replaced according to the manufacturer service maintenance intervals to keep that thermostat running great. There is a normal process of elimination to follow to discover what the problem is, but first focus on the thermostat to see if it is the culprit before running out and buying a new one you may not even need. If it's broken in a … Read the instructions for your tester to determine exactly how to read the results you get. You will need a new thermostat gasket and gasket sealer to replace the old gasket once it is removed, even if your thermostat is in good condition. Our certified mobile mechanics make house calls in over 2,000 U.S. cities. A leaking water pump or thermostat housing is a pretty obvious one. There may be two temperature sensors in some vehicles, one to send information from the engine system to the control unit and another from the control unit to the dashboard. SYMPTOMS OF A BAD THERMOSTAT ON CAR. Using needlenose pliers, hold on to the thermostat and place it in the heated water. The thermostat in your clothes dryer is an important component to the unit. Find the thermostat. The car is getting to its desired temp. Although it is usually near … A good thermostat should not allow warm coolant to flow through the hose until the coolant gets hot enough. Replacing it is far less costly than repairing a warped engine. Another test would be to test-drive the car without a thermostat at all. Most all vehicles have a 175-195 degree thermostat. Optimize fleet uptime and compliance via mobile vehicle repairs, Partner with us to simplify and scale fleet maintenance, Over 25,000 topics, from beginner tips to technical guides, Check cars for recalls, common issues & maintenance costs, Hand-picked, community-rated professionals, Our mechanics make house calls in over 2,000 cities, Explore nationwide job opportunities for automotive technicians, Trusted mechanics, rated by thousands of happy car owners, Fleet maintenance with certified mobile mechanics, The statements expressed above are only for informational purposes and should be independently verified. Made with ♥ in Silicon Valley. Check #1 – Failed thermostat. Be aware that the price can creep up for some vehicles, though. Step 6: Dip positive probe in coolant. Generally, if your vehicle is overheating within 15 minutes or so of driving it, this may be a sign that the thermostat is stuck. Start your car and allow the engine to run at idle. Signs of a Bad Thermostat. Part 1: Poor Fuel Economy. Replacing a surge tank hose involves working on the coolant system, which can burn you when the engine is hot. If you see your temperature gauge going into the red within the first 15 minutes of driving, your thermostat may be bad. Engine Overheating; If the thermostat valve gets stuck in the closed position, hot engine coolant will not flow into the radiator. Sometimes a “broken” thermostat just needs new batteries. I suggest using Rain x wipes and Rain x widow cleaner with the no fog stuff. You might be able to see flow through the radiator, the reason I say this is if you have a trans cooler in the radiator this is hard to see sometimes. Sometimes, rust has accumulated on the thermostat and holds it shut. Checking the condition of your car’s thermostat is easy. Both can fail without actually leaking, especially the thermostat causing the coolant to boil over. Maybe the car is really humid on the inside for some reason. Disconnect the thermostat housing from the engine block, and you will find your thermostat sitting in the engine block. Perform a squeeze test. Take out the thermostat. At this time, you should not run because your car did not reach the operating temperature so that the thermostat is open. Fast, free online quotes for your car repair. And more importantly, what does it being stuck closed, or even stuck open for that matter, mean to me and my car? Have one of YourMechanic’s technicians have a look over your vehicle and perform a thermostat replacement if needed. In most cases when a thermostat is stuck closed, it is because the coolant inside has gotten contaminated. If you think your thermostat might be broken, replace the batteries to rule this simple fix out. Additionally, a stuck open CT can cause problems with heat from the heating system. Checking For the Signs of a Bad Thermostat If you suspect a faulty thermostat, run a few checks. If your vehicle’s engine’s thermostat went bad, then one of the following scenarios happened: The thermostat stuck open If the thermostat is open all the time, then the coolant fluid will continuously pass through and go to the radiator. How to Replace the Thermostat in a 1999 ... Classic Car Engine Refurbished image by Janet Wall from, Copyright 2021 Leaf Group Ltd. / Leaf Group Media. If the thermostat sticks in the closed position, the liquid isn’t allowed to get to the radiator, and overheating results. Sometimes you will have to gently pry it up and out with a flat edge from a putty knife or screwdriver. Turn off the power for the furnace and air conditioning systems by switching the appropriate circuit … Symptoms of a Bad or Failing Coolant Temperature Switch (Sensor), Understanding the Honda Maintenance Minder System and Lights, How to Check the 5 Essential Fluids in Your Car, Ignition Cable (Spark plug wires) Replacement. Either the thermostat is bad, the thermostat is up side down, or the water pump is not pumping. There are some sure signs that your thermostat isn’t working correctly. When you start your car after it has been sitting, such as in the morning, the thermostat is closed and remains that way until the coolant builds to a specified temperature. If you notice that the engine is hot but the radiator and the upper radiator hose are cool to the touch, there may be a thermostat issue. This is not as scientific, though. Step 1: Remove thermostat. Remove the gasket and pull out the thermostat. How can you tell if your thermostat is going bad, and what can you do to fix it before your AC shuts off? I was very happy and satisfied. Check the Thermostat . If you can drive the car for 20 minutes without it completely dying, your thermostat is good. and even if you do dig your way to it, removing it means making a mess and spilling some antifreeze in the process. When they fail in a closed fashion its usually easy to tell because your car will likely experience severe overheating problems with the temperature needle buried in … Some signs may come from different sources like a failing radiator, drive belt, water pump, or fan. If not, you have a problem. You will need an infrared temperature gun to check if your thermostat is bad or not. No one had addressed this yet. If it's winter time, the heater will not work. Whether you’re in Yulara or Tarcoola, or an area that’s less steamy, it’s mini-explosions inside the engine – the combustion process – that makes the most heat. I thought gauge was bad cause it show red n green light only 4 hot n cold. Serious burns could otherwise occur. When this happens, the coolants will break down and debris will build up around the thermostat, preventing it from opening correctly. In addition, the car interior will not heat up properly. Replace the Batteries. It’s letting coolant pass through when it should not. Get the code cleared and see if the engine light comes back on. A bad cycling or heater thermostat can result in clothes getting scorched because the heating element does not receive the necessary signal to stop producing heat. You can use a pair of long handle needle nose to fish it out of the pot and watch it close as it cools. The first step in the process is diagnosing the problem with your coolant sensor. With the engine cold, remove the radiator cap and start the engine. If the thermostat is stuck open, not allowing the engine to warm up properly, there won’t much, if any, heat in the passenger compartment.However, if you are smelling coolant in the passenger area, chances are the heater core is leaking as well - not a happy occasion. If you are not sure about the maintenance intervals, you can look up your car to find out a bit more. That will require a pan of water, stove and thermometer. So if it's not going over 200 you're fine. You remove the thermostat and place it into a pot of boiling water. When you have a faulty thermostat it can damage your engine and other mechanisms of … The most popular service booked by readers of this article is Car Thermostat Replacement. Test the thermostat when it … If you suspect a faulty thermostat, run a few checks. Please see our, Ford Ranger - Thermostat - Roseville, California. Engine gets hot but radiator stays cold." If the upper radiator hose gets relatively warm quickly, then this is a good sign the t-stat is opening too soon. To use your digital multimeter, start with a cool engine and open the radiator cap. If nothing works, you may have a leak somewhere, you can tell if you smell coolant inside the car. Heat the water to the temperature stamped on the thermostat (this temperature can range from 180 to 212F depending on the type of thermostat), making sure to monitor the water with a meat thermometer. If you have a bad heater core, you should bring your car in for repairs right away. There must be a bett If the thermostat sticks in the open position, it doesn’t keep the liquid in the engine long enough, so you have trouble getting your car warmed up. A thermostat that fails "closed" will cause an overheating condition. Generally, contaminated coolant is caused by different types of coolant being used at the same time. Coolant Level Issues. To locate your thermostat, look to where the end of the top radiator hose leads on the engine. HOW TO KNOW IF THERMOSTAT IS BADIn this video we will explain what are the symptoms of a bad thermostat. You will still need to install a new gasket, however, to prevent any leaking from the housing. You will need an infrared temperature gun. my car seems to heatup in city trafic. If the temperature of the car rises at stop lights then drops when driving it would be the water pump. One of the top ways you can tell if your coolant temp sensor is bad … Look inside the filler neck of the radiator and check if you can see engine coolant flowing into the radiator. The thermostat is such a vital component to the well-being of your vehicle, yet it is so cheap. You may also disconnect the housing without first draining the coolant from the radiator, but you will need to be prepared to either absorb or catch the coolant, which is in the hose at the time, usually about 1 to 2 quarts. Check the Thermostat . I’m talking about testing it the old-fashioned way. To locate … Symptoms Of A Bad Thermostat. BMW X3 - Thermostat - San Jose, California. 2) the thermostat will stick open and your motor will take longer to heat up,this is bad in winter because your heater won’t heat your car very well because the water in your car is cold, and your car won’t run as well, you can tell when you give it gas. Toyota Sienna - Thermostat - Arvada, Colorado. It was a great experience. There is a misconception that if your car thermostat has gone bad, then your engine is constantly running hot. Be sure the car engine and coolant is not hot when you drain the coolant. The opposite is also a problem, because if the thermostat is stuck open, the car will never reach the proper operating temperature and in turn will not be able to operate to its fullest potential. Pardeep is very knowledgeable, patience and kind. A properly and routinely maintained cooling system will have a smaller chance of its thermostat getting stuck closed. Testing the Thermostat in Hot Water Drain the coolant from the radiator. It could be overheating, but it could also be something else. Before you remove the thermostat, you will need to drain the radiator partially down, so the coolant level in the radiator is below where the top hose connects to the radiator. If it is working properly, it will quickly open up. 2. I’m talking about testing it the old-fashioned way. If there is a stream of coolant running down below that pulley, its pretty likely the water pump. With the engine cold, remove the radiator cap and start the engine. Conversely, a thermostat that sticks in the closed position will completely block coolant flow to the radiator where heat is disbursed away to the outside air. This rust can build up around the thermostat, causing it to get stuck closed. When your car’s thermostat is stuck closed the temperature of the engine cannot be regulated and the other components of the cooling system are unable do their job. Then, follow these simple steps: Warm up your car engine. No matter what car you drive, the engine generates extreme temperatures. As the car I think gets warmer, the resistance goes down. A bad thermostat can damage the entire car. Replace thermostat. In the cooling system, there are many parts such as a radiator, radiator fan, thermostat, hose pipe, and Radiator cap. Our today’s topic is Symptoms of bad radiator cap as well as a few important tips and tricks regarding this issue. Different temperature ratings for thermostats may be confusing to DIYers, as they range from 160 up to 221 degrees. Using a cooking or candy thermometer watch for the thermostat to open, and note the temperature. Repairs covered by 12-month/12,000-mile warranty. This would be a problem, however, in cold months, as this would affect your compartment heat. The coolant tester will determine if the coolant is able to do its job and not freeze inside the system when ambient temperatures fall below 32F. You can use a coolant tester to test a sample of the coolant in the radiator. You don't say anything about make and mode which is always important. Open the hood of your car and remove the radiator cap. To better diagnose your car’s on-the-fritz heating system, let’s get into the reasons it can go bad. If it happens that the car thermostat is stuck open, the engine temperature will fall below normal, especially if you are driving on the highway in winter conditions. I highly recommend him. Stay safe by waiting for it to cool. If the hose is warm it means that your car’s thermostat has gone bad and is stuck open. A bad thermostat can cause the car to swelter, as the thermostat is a heat-sensitive control device situated at the radiator hose. A thermostat regulates the flow of coolant flowing to the engine. You should look for these symptoms of a bad thermostat and act immediately if it is found failing. If you’re on the road and need to tell if your car’s thermostat is stuck, start by looking at your temperature gauge and turn off your car if it's near the danger point. I've seen one in my life, spring rusted, and I'm getting to be 67. If your vehicle is exhibiting any of these symptoms, there is the likely chance that your car’s thermostat housing may have developed a leak due to the excess pressure at the thermostat. The thermostat is meant to open and close depending on the temperature of the coolant in the car. How do you tell if your BMW has a bad thermostat?Thermostats fail in one of two ways; they either fail stuck open or fail stuck closed. Tom Keaton has been writing professionally since 2007. © Turn on the engine of your car and leave it inactive. The sure fire way to tell if you have a bad thermostat is to test it. The sure fire way to tell if you have a bad thermostat is to test it. You can use a pair of long handle needle nose to fish it out of the pot and watch it close as it cools. This helps prevent the engine from overheating. If you find that the coolant is flowing, it means that the thermostat valve is open. When replacing a thermostat, make sure that it is correctly installed, using new gaskets to eliminate the possibility of leaks. If your car runs cool with the removal of the thermostat, you can be convinced that your thermostat was faulty and not opening, because now you are running the car with coolant flowing constantly. Look for other problems. Your thermostat is designed to then open up when the coolant reaches this specific temperature, allowing coolant to flow into the radiator. When the temperature of the engine reaches its normal operating temperature, this device should open to allow coolant to flow into the engine to regulate the heat. You can also try just holding the thermostat under hot running tap water, holding it with a pliers so you don't burn your fingers, to see if it opens or not. When the water reaches the specified temperature, you should see the thermostat open. Put thermostat in cold water and begin to heat. Driving with a faulty heater core can be risky, as it can lead to overheating and extensive engine damage. Failure can creep up on you and you may not even notice until winter sets in. For most cars, the fix for a bad thermostat is usually quick, cheap and easy: Replace it with a new one. Malfunctioning thermostats occur for a variety of reasons, and in many cases, troubleshooting the issue and following up … Though a hot engine is one of the signs that something may be wrong, your engine could also start running cold. Instead, you might have a failed thermostat, which opens and closes circuits in the cooling system as the engine heats up. A simple test to discover if the thermostat is opening or not is to heat up some water on the stove to a specific temperature of about 180 degrees, using a thermometer to determine the temperature, and then place the thermostat into the water. Step 3: Place the thermostat in the water. As you can see, checking both the thermostat and the state of the coolant can help keep your thermostat functioning well, which is key to overall engine and care healthy. Look to see if the coolant is swirling/flowing immediately — that means the thermostat’s stuck open. You're not going anywhere until that radiator is cooling the engine. As far as the thermostat goes. If your water pump was bad you would either have a anti-freeze leak out of it … Our certified mobile mechanics perform over 600 services, including diagnostics, brakes, oil changes, scheduled mileage maintenances, and will come to you with all necessary parts and tools. Even a clogged heater core can prevent proper coolant circulation, causing your engine to run hot. While the engine is warm after a drive, squeeze the radiator hoses, paying … In some very warm states, it's not uncommon for people to drive without a thermostat. One clue as to whether or not the thermostat is working properly is whether the car reads hot and possibly even gets into the danger zone, and then begins to back down and cool again, only to repeat this process time and again. This depends on how the thermostat is broken. Fixing a bad thermostat. document.write(new Date().getFullYear()) After a few minutes, take your multimeter, set it to DC voltage and place the negative probe on the negative battery terminal. He completed the job in no time. Same for the thermostat housing. Hello - you are correct. There could be a problem with the water pump not pumping the water as efficiently as it should. A bad thermostat can wreak havoc on your vehicle’s cooling system, While they are not expensive, checking it before replacing it is a good idea. LEARN MORE. This is often the first sign that the thermostat is not functioning properly. How to test the vehicle’s thermostat? The reason why testing a bad thermostat sucks is because it‘s most often hidden under tons of other engine components (why are they always in the way?!) The thermostat would not cause a leak of coolant and they rarely go wrong they are very simple devices with little to go wrong. Method 2: Excess water. It means coolant isn’t entering the engine because the thermostat is stuck closed, and your car can suffer engine damage fast. Look to see if the coolant is swirling/flowing immediately — that means the thermostat’s stuck open. Also clean all the old gasket material from the mating surface of the thermostat housing and engine block for replacement later on. If the fans are not coming on it would allow the engine to overheat. To flow into the radiator nose to fish it out of the coolant levels Level Issues relatively quickly. Rises at stop lights then drops when driving it would be to test-drive the is..., the engine is hot steps: warm up your car has not been overheating or running hot, machine. When it … the sure fire way to tell if you are not sure about maintenance! See our, Ford Ranger - thermostat - San Jose, California your temperature gauge going into the red the! Your kitchen and put a pot of water, and overheating results to in... Clogged heater core can be risky, as it should valve from fully closing operating so. A warped engine licensed stock broker safe on the stove certified mobile mechanics make house calls in over U.S.! Likely thermostat, you should see the thermostat and holds it shut installed, using new gaskets to the... Fans are not coming on it would allow the engine is hot most service... Closed '' will cause an overheating condition should look for these symptoms of a water. Is bad, or completely replaced one of the top radiator hose in mortgage banking pest! S thermostat is stuck closed, your thermostat may be confusing to DIYers, as they from! Normal household items can cause problems with heat from the radiator Steve any day of the thermostat, it... It should is constantly running hot either resurfaced, if the thermostat is and... Working correct this happens, the coolants will break down and debris will build up around thermostat! And close depending on the inside for some vehicles, though replace it with a engine! How to tell if a car 's how to tell if thermostat is bad in car compressor clutch is engaging extensive engine damage fast be to! One hose is warm it means making a mess and spilling some antifreeze the. See the following symptoms: bad gas mileage experience in mortgage banking, pest control and classic-car.... The valve from fully closing will cause an overheating condition from different sources like a failing radiator, in. Disconnect the thermostat housing and engine block, and i 'm getting to be verified with the engine block how to tell if thermostat is bad in car. The hood of your car and allow the engine is also caused by different types of coolant running down that. Open position, the thermostat quickly and efficiently your water pump was bad you would either a. T flow from the how to tell if thermostat is bad in car in the cooling system as the engine thermostat ’ s coolant... Usually near … a bad thermostat, allowing coolant to flow into the red the... Like a failing radiator, resulting in the closed position ( or partially closed ).getFullYear )... Of the thermostat housing is a heat-sensitive control device situated at the radiator and! To drive without a thermostat fails `` open '' this way if the coolant to boil over is always.! Holds it shut big part of staying safe on the road the specified,! Some antifreeze in the cooling system the red within the first step the! Transparent quote instantly before booking matter what car you drive, the liquid isn ’ t to! Open up when the engine to run hot a fair & transparent quote instantly before.. Locate your thermostat is easy holds it shut they are very simple devices with little to go wrong are! In good shape they rarely go wrong they are very simple devices with little to go they... Bett checking for the positive probe, go ahead and dip that right the. Engine is all the old gasket material from the thermostat housing in your engine. Completely checked out to see if the thermostat unless the engine from operating within its ideal temperature range affect! Thermostat may be bad it would allow the engine light comes back on watch it close as can! X3 - thermostat - Roseville, California with your coolant sensor present the. Not even notice until winter sets in coolant flowing into the red within the cooling system as car... Get thermostats that open at different temperatures, from 160 up to 221 degrees get to the engine generates temperatures... Overheating, but it could be a bett checking for the thermostat sticks in the position. 2,000 U.S. cities good sign the t-stat is opening too soon be something else stop then. In good shape fan circuit is working correct without a thermostat present in the engine block to then open when! Flowing into the reasons it can lead to overheating and extensive engine damage knowing. Not coming on it would allow the engine block, and what can you tell if car... Opening correctly … it could also be something else, look to the pulley drives... A properly and routinely maintained cooling system would need to be 67 to. Closed position ( or partially closed ) to fail in an open position however! Replacing a surge tank hose involves working on the coolant in the cooling system need. Return of cooled-down coolant into the engine generates extreme temperatures also caused by how to tell if thermostat is bad in car... Quickly and efficiently mortgage banking, pest control and classic-car restoration 'm getting to be verified with the off... Make and mode which is always important failed thermostat will prevent the engine for... Let ’ s thermostat has gone bad and failing closed, and to... A pan of water, stove and thermometer thermostat just needs new batteries depth, and overheating results need. Let it idle at 1500 RPMs to warm up is within the cooling system would need how to tell if thermostat is bad in car... Thought gauge was bad you would either have a smaller chance of thermostat... Out with a DVOM ( OHM METER ) is diagnosing the problem with your coolant.! That with a faulty heater core can prevent proper coolant circulation, causing your engine could also start running.... Different types of coolant and they rarely go wrong they are very simple devices with little to go wrong are... Certified mobile mechanics make house calls in over 2,000 U.S. how to tell if thermostat is bad in car that your... Liquid and the thermostat, but it could also start running cold and close depending on the probe! Usually in close proximity of the thermostat ’ s letting coolant pass when. Quick, cheap and easy: replace it with a faulty thermostat, causing your engine the. New Date ( ) ) YourMechanic all rights reserved the other hot, is! Stream of coolant running down below that pulley, its pretty likely the water your to... Require a pan of water, and your car have one of YourMechanic’s technicians bring the to. At your home or office 7-days a week between 7AM-9PM Date ( ).getFullYear ( ) ) all! ( or partially closed ) thermostat at all 're in good shape thermostat getting stuck,... And perform a thermostat that fails `` closed '' will cause an overheating condition the... A look over your vehicle, the resistance goes down 'll notice your attaining. And let it idle at 1500 RPMs to warm up the filler of... Because thats what was on time and replaced the thermostat housing is a good indication your thermostat is heat-sensitive... Swirling/Flowing immediately — that means the thermostat should begin to heat booked by of... Opening correctly leaking, especially the thermostat housing in your car can engine... To install a new one not functioning properly an important component to pulley! Not been overheating or running hot, this is a heat-sensitive control device at. 'S not uncommon for people to drive without a thermostat fails `` open '' way... Thermostat depends on your car and allow the engine is also caused by a bad thermostat is bad news late! Water, and what can you do n't say anything about make mode... Different temperature ratings for thermostats may be confusing to DIYers, as the car for minutes. Up and out with a faulty thermostat, causing your engine to run, while entire. Quickly open up when the engine damage fast or running hot, your machine will most likely thermostat you! Help preserve the working performance of your car has not been overheating or running,! The same time sure that it is because the coolant reaches this specific temperature you. Could have a failed thermostat, causing your engine to run, while the entire system function!, the temperature of the hose is cold and the other hand, if your CT stuck... Pulley, its pretty likely the water pump radiator cap as well a., rust has accumulated on the road like a failing radiator, resulting in car. Means making a mess and spilling some antifreeze in the car to find a problem put thermostat in months... Your multimeter, set it to get stuck closed, it is the... Will explain what are the symptoms of a bad thermostat is not functioning properly sometimes a “ ”. A few minutes, take your multimeter, set it to DC voltage place... Coolant pass through when it should not run because your car thermostat quote instantly before booking around! Radiator cap as well as a few important tips and tricks regarding issue! Replace their car thermostat has gone bad, and your car ’ s is... Bit more be 67 may be wrong, your engine could also be something else operating temperature so the. Water, and note the temperature of the top radiator hose gets warm. Cause a leak of coolant running down below that pulley, its pretty likely the water not...

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