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how often do you have to change the thermostat , and how can you tell

Answers from the Automotive Experts

Amanda J. Pierce, MBA Madelin, There is no real mile marker set for the replacement of a thermostat, coolant condition can prematurely wear a thermostat out.

Lori Johnson, Owner and Instructor at Ladies Start Your Engines Dear Madelin, I'm assuming you're talking about the cooling system thermostat? You only replace this when it goes bad. Usually the car will overheat when you have this problem. But that's if it's stuck closed. If it's stuck open you'll find it very hard to heat your vehicle and the temperature will not rise much off of the C. Lori Johnson

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