Why Is My Car Still Overheating With a New Thermostat?

A few days ago I noticed that my car’s temperature was running high. I was told that the overheating was probably caused by a lack of coolant or a bad thermostat. I’ve made sure the coolant is full and replaced the thermostat, but it’s still overheating!! Why would it still be overheating even with a new thermostat and what can I do about it?

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Answer provided by
Patrick Price
Answered on Mar 25, 2022
I’m sorry, that sounds very frustrating! Unfortunately, problems with overheating can be caused by several different issues. If your car is overheating with a new thermostat, you could be dealing with a clog in your radiator and/or heater core, a bad water pump, a broken radiator, or any number of other coolant-related issues.
The first and most important thing is not to drive your car until the issue is resolved. That could cause disastrous damage to your entire engine. If you’ve already tried to fix the problem on your own, it’s probably time to have a professional mechanic look at the car.
When diagnosing the issue, a mechanic will look for these common problems that can cause overheating after getting a new thermostat:
  • Bad coolant: If the coolant is failing, faulty, contaminated, or just the wrong kind for your engine, it would cause overheating even when topped off.
  • Bad water pump or belt: the water pump and belt work together to circulate water from the radiator. If one or both of them is damaged, it would cause overheating
  • Broken radiator: All coolant in the world won’t keep your engine from overheating if the radiator is broken
  • A clog in the coolant system: If there is a blockage anywhere in the coolant system, it will stop the fluid from circulating properly which could lead to overheating
  • A faulty head gasket: This is a more serious issue that could affect virtually every aspect of your engine’s functionality
  • Improperly installed thermostat: If you installed the new thermostat yourself, and haven’t done it before, you may have installed it improperly
These are just some of the many possible causes of overheating. The mechanic will have to continue troubleshooting until the root of the problem is discovered.
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