How to check your car thrmostat


Removing and replacing the thermostat

How a thermostat works:

Check the radiator hoses for differences in temperature. If one usually the top is cooler, but the bottom is burning up, that indicates the thermostat is stuck closed as well. Do not stick your hand near the front of the engine while the fan and belt are moving, and never remove the radiator cap from a hot engine.

The final test involves removing the thermostat and doing a temperature test. Heat up a pot of water to the stamped temperature on the thermostat and use a pair of pliers to hold it under. Thermostat failure can be caused by contaminated fluid or simply an old thermostat with weakened springs.

Contamination happens when incompatible coolants are mixed, old coolant is not changed as recommended or particulate matter from gaskets or elsewhere breaks off. Generally you can steer clear of contamination with proper maintenance, but thermostats themselves can also just wear out over time. Photo courtesy of Flickr. Your email address will not be published.

Save my name, email, and website in this browser for the next time I comment. How It Works Located where the top radiator hose meets the engine, thermostats open or close in response to coolant temperature. The Heat Is On Thermostats fail because they become weak, stuck open or stuck closed.

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Keeping Your Coolant One sign that you might have a stuck-closed thermostat is rapid temperature increase during normal operation. Related Articles. By Blair Lampe October 4, Keegan July 24, November 7, October 30, This is a real problem and can cause your engine to overheat rapidly. If your thermostat is working properly, there are other coolant related issues that can cause your engine to overheat.

Thermostat failure signs

Your coolant passageways might be blocked with rust or other engine sediment or there may not be enough coolant in the engine. Often, coolant levels drop due to a leak. Keep an eye out for any puddles near your vehicle that could indicate a leak and replace it right away while seeking professional help.

Leaks can occur in many different parts of the engine and can be very difficult to find.

Understanding and Testing Thermostats -EricTheCarGuy

You also may be using the wrong type of coolant for your engine. Your radiator is responsible for cooling down the engine coolant as it passes through. This means that proper radiator function is vital to maintaining the engine temperature.

Check Car's Thermostat | Desjardins Insurance

When a radiator problem is causing your engine to overheat, one of the first things you should check is the radiator fan and all of the fan parts. Instead, stop the car and attempt a few quick fixes first.


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You should always make sure to keep extra coolant and water in the trunk of your car and try adding those first if your engine begins to overheat. Your coolant level may just be a little too low. This may seem counterintuitive, but turning on the heat can help shift the heat away from your engine.

Why Does My Car Have No Heat?

After a few miles, you can turn it off and check how the engine is doing. One thing you should avoid doing if your engine overheats is pouring cold water into the hot radiator. At The Garage Auto Repair, we provide your car with expert service through regularly scheduled maintenance and on the spot troubleshooting. Call The Garage Auto Repair today to discuss your car care needs with our mechanics.

how to check your car thrmostat How to check your car thrmostat
how to check your car thrmostat How to check your car thrmostat
how to check your car thrmostat How to check your car thrmostat
how to check your car thrmostat How to check your car thrmostat
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