3 ways your thermostat can fail (and what you can do about it) | Haynes Publishing

This inexpensive part has a simple but important job, and like any hard-working part on your car, it needs replacement from time to time. If you suspect the thermostat may be bad, by the time you get the housing off to check, it is easiest to just replace it. But how do you know if your thermostat is failing?

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