Does Taking Out A Thermostat Prevent Overheating

Posted in Cooling Perfomance

I have a 1998 Sunfire and I had replaced the thermostat (not knowing any better) because it was overheated. It is still overheating. According to the mechanic, he took the thermostat and the car is no longer overheating (although he says that this is only a temporary solution). Does that make sense? It seems that it would not help anything. Is it dangerous to drive around them like this?

There are 8 Answers for "Does Taking Out A Thermostat Prevent Overheating"

    1. edya19 says:

      if still overheating you either have a radiator or water pump problem.

    2. ken k says:

      car has a circulation problem/thats like putting a broken arm in a sling without setting the bone/water pump impellars may be damaged or broken or rad may be clogged/12 year old car lots of stuff

    3. Dan W says:

      It will prevent overheating from a bad thermostat. Any other problem it will not help.
      Replace it with a thermo that fails in the open position.

    4. niceee33 says:

      From what i understand. If you take out the thermostat the water is constantly in circulation so is less likely to over heat. Therefore it’s a tempory repare as the cause of the problem is still present. I would say only dangerous if over heats & you dont want to cook the engine.

    5. pat j says:

      The thermostat isn’t usually the problem of overheating. It’s nearly always the radiator that needs servicing. Although the overheating is not happening now but it will eventually. The bad thing about running no thermostat is that the engine doesn’t reach operating temperature and the heater generally doesn’t work. If you were to ask the engine to do some hard work like towing or long hill climbs it would overheat.

    6. Dues says:

      Is it dangerous? no.

      However you may have a bigger problem. The engine coolant/antifreeze serves multiple functions. 1. Keeps your engine running at an acceptable temperature and 2. Provides the heat for your heater to work. The coolant resides in the radiator and travels up to your thermostat. When a running engine get hot the thermostat opens and allows coolant to enter the engine. This cools the engine and maintains an acceptable engine temperature. Once the coolant leaves the engine, it flows into a small radiator looking thing called a heater core located under your dash board. This is where your heat comes from to heat the inside of your car. A blower blows air through the heater core and you get heat. Once the coolant travels from the heater core, it goes back into your radiator where it is cooled by outside air and a radiator fan. The force supplied to the coolant (so it can travel as explained above) is supplied by the engine coolant pump (or water pump). This is located within the engine and is driven by the fan belt or serpentine belt.

      So back to your question, it is not harmful to run your engine with out a thermostat however your engine will run cooler and your heater will not work especially in frigid temperatures.

      It sounds to me that you either have a water pump that is going bad or your radiator may need a good flush. By removing the thermostat, your mechanic is masking the problem.

      With either problem stated above, I would get it looked into because if the radiator goes or the water pump goes, you are SOL.

    7. sulaiman_44 r says:

      Yes in very hot whether 40-50 c or more it is OK to take off the thermostst,but it is likly to put it back when the tempeture is less than 25*C to let the engine warm nomaly.

    8. Mikaela P says:

      You car could have 1 or more problem causing overheating. I suggest to check first your radiator if its clog, your water pump if its working properly, and your fan and auxiliary fan if they are working properly. Also check for leaks (internal and external). Hope this helps!