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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. 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.

*also engine that runs too cool is often cause by a broken thermostat as well

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Q: How do you know your engine thermostat has failed?
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