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Car is overheating you can only drive it bout 15 minutes then it starts to over heat. Already replaced the water pump, radiator. Could it just be the thermostat

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  • Cars & Trucks Master
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Yes the thermostat will cause this problem.do not drive it like this. You can blow intake or head gaskets or even warp the head or engine block. You can also crack one of them rendering the engine as junk.

Posted on Apr 20, 2017

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  • Cars & Trucks Master
  • 2,027 Answers

I think it sounds like the thermostat. Before you spend a lot more I would replace it. Not expensive to change.

Posted on Apr 20, 2017

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Posted on Jan 02, 2017

j_del
  • 1586 Answers

SOURCE: Overheating

Who did the replacement of the parts? Was it done at a shop or at home? Do you know if the cooling system was "burped" after the parts were installed and the coolant was refilled? If you're not sure, burp the radiator. This is easy to do. Jack up the vehicle so that the thermostat is angled upward. Start the car and let it idle until it's 3/4 of the way to overheating, then shut it off and allow it to cool down somewhat. Then pop the cap, let the coolant drain down, and refill it. Restart the vehicle and repeat the process, until the coolant level doesn't drop anymore.

What you're doing is this - anytime the cooling system is opened up, especially when the fluid is drained and parts are replaced, air gets into the system. When you reassemble and refill with coolant, you trap air bubbles in the system. Since the system is sealed, it operates under pressure. As the car runs, the coolant and the air bubbles are circulated. The bubbles get caught behind the thermostat (if you have it angled upward) and keep it from opening. This causes the engine to heat up to the point of overheating. You want to allow it to get about 3/4 of the way to an overheat so that you know the air bubbles are blocking the thermostat. Shutting down the car stops it from heating up to the point of damage, and allows the system time to cool off so that when you pop the cap, you don't get an explosion of coolant in your face. Once it's cool enough to open the system, you open it and release the pressure. This allows the thermostat to open and bleed the bubbles upward to the open cap, where they "burp" into the air. The space they took up fills with coolant, which is why your coolant level drains down. You top it off and repeat to make sure that all the bubbles are out. You'll know you're in good shape when you let it run and it gets to operating temperature and doesn't overheat anymore. Let it cool that final time, open the cap, and since you have no air pockets left in the system, nothing will burp out and your coolant level won't decrease. Then you should be good to go - put the cap back on and drive away happy.

Posted on Sep 28, 2008

bricktour
  • 1 Answer

SOURCE: overheating

Be very careful relaying on the fans as I blew a head gasket when they did not come on. Still sounds like a froze thermostat

Posted on Feb 02, 2009

  • 2 Answers

SOURCE: Car all of a sudden started overheating. Already

The thermostat is the most likely problem and also the easiest/cheapest to replace. You could also start by checking the fuse for the electric engine fan, if it is good you could try to disconnect the fan and run 12v ( + and -) to it directly from the battery. It should turn on.

Posted on Jun 27, 2009

  • 400 Answers

SOURCE: what causes 1991 toyota camry to over heat? we put

Change the radiator cap, it may be the wrong pressure rating which will cause the coolant to boil at a much lower temperature than designed.

Posted on Nov 18, 2009

  • 264 Answers

SOURCE: 1995 BMW 525I over heating issue. I repaired head

Hi, Sounds like you have tried about everything. Ok the aux. coolant switch is for the electric pump for the heater core will not cause an over heating condition just a longer warm up of the heater core. Has the cooling system been bleed properly if there is a trapped air pocket it will not let coolant circulate. Was the new thermostat installed correctly? They have a vent that needs to be towards the top or they trap air on the back side and cant take an accurate reading to open and close. Other areas to look at would be proper operation of the fan clutch, if they fail they can cause the fan to not lock up properly and supply enough air movement through the radiator. The aux. electric fans and their temp switches do you hear them coming on are they coming on at the right temp.

Posted on Aug 26, 2010

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