What would cause a car thermostat to fail?

I just had the thermostat on my Ford fixed about a month ago and this morning, I noticed a coolant leak in the garage. How could I have broken it already? What causes a car thermostat to fail?

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Answer provided by
Shannon Martin
Answered on May 09, 2022
If you just had the thermostat replaced and it is already broken, it is not your fault! The thermostat could fail for any number of reasons such as:
  • Age
  • Overheating
  • Sludge
  • Defect
Since sludge buildup happens over time, I suspect your thermostat may be defective or the Ford engine overheated for a different reason. An engine can overheat if there are performance issues with the radiator fan, water pump, or coolant hose.
Check with your mechanic to see if your truck has any other issues and to find out if their work is under any kind of warranty.
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