Skip the auto shop - Our mechanics make house calls

How Long Does a Thermostat Last?

Thermostat

No matter what kind of car or truck you drive, it has a thermostat in it. This thermostat is responsible for monitoring and regulating the coolant temperature in your vehicle's engine. If you were to look at the thermostat you would see that it is a metal valve and has a sensor built right into it. The thermostat does two things - it closes or it opens - and that’s what determines how the coolant behaves. When the thermostat is closed the coolant is kept in the engine. When it opens, the coolant is then able to circulate. It opens and closes based on the temperature. The coolant is used to prevent your engine from overheating and causing serious damage.

Because the thermostat is always working and always opening and closing, it's quite common for it to fail. While there is no set mileage that predicts when it will fail, it's important to act on it once it becomes faulty. It's also recommended that you replace the thermostat, even if it's not failing, each time you do work on the coolant system that is considered major.

Here are some signs to watch for that can signal the end of the lifespan for your thermostat:

  • If your Check Engine Light comes on, this is always cause for concern. The problem is that you can't tell why it has come on until you have a mechanic read the computer codes and diagnose the problem. A faulty thermostat can certainly cause this light to come on.

  • If your car heater isn't working and your engine remains cold, it could actually be an issue with your thermostat.

  • On the flip side if your engine is overheating, it could be your thermostat not kicking in and allowing the coolant to circulate.

The thermostat is an important part in ensuring your engine is able to operate properly. The thermostat allows coolant to circulate when needed in order to cool down the temperature of your engine. Without this part working, you risk your engine overheating, or not warming up enough. Once the part becomes faulty, it’s important to have it replaced immediately.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

Insurance Requirements for Car Registration in Kentucky
The Kentucky Transportation Cabinet requires that all drivers in Kentucky carry liability automotive insurance, or “financial responsibility” in order to operate a vehicle legally and maintain vehicle...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...


Related questions

Q: Lights work, but car won't start.

I would need more information to determine the problem. If you hear a clicking noise but the engine wont turn over, then your battery may not have enough charge or may have a bad connection. Test the battery, if the...

Q: Coolant leak in a 2002 Cadillac Escalade

The most common coolant leak other owners have had is the water pump leaking. The typical repair is water pump and thermostat replacement. I recommend having a mechanic, such as one from YourMechanic, inspect your coolant leak, which may involve...

Q: Temperature gauge goes up and down and I have to replace antifreeze daily

Hello, thank you for writing in. The smoke from the exhaust and the loss of coolant most likely means that your head gasket has failed, and is leaking coolant into the engine. The coolant gets burned up with the air/fuel...