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Engine overheating even after replacing thermostat

Just replaced thermostat but car is still overheating, quicker when in drive then in neutral, liquid raises to top of receptacle and does not drain down. Did I buy a dud new thermostat or is it something else

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Even though this may seem like a dumb question but did you install the thermostat the correct way? the spring should be fascing toward the intake of the engine. if this doesn't help you need to try anf lush the system you might have a blockage in the system. if it styill persists that means the water pump is not circulating the coolant and the pump needs replacing. also be sure to see if your electronic cooling fan is working

Posted on Apr 18, 2009

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Posted on Jan 02, 2017

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replace your thermostat and check the waterpump. The ac "pulls" heat out of the air in the car thereby making it cooler, at the expense of making your coolant heat up even quicker than normal. Try this to see what's going on.. Open the radiator cap, start the engine and wait until the car gets up to operating temperature. You should be able to see the water circulating through the radiator...if the fan comes on, and the water isn't moving, then replace the thermostat. If it still isn't moving after that, the water pump may be no good. Id bet on the thermostat. They're cheap and need to be replaced every so often. If the water is circulating and the fan never turns on, then you check the fan motor, relay, etc. There is also a temperature sensor located somewhere next to the thermostat. It's rare to have to replace that, but if it's faulty, then the fan won't turn on and thus overheating occurs. I am assuming here that if you drove your car up a hill without the ac on, it will overheat or get hotter than normal...So....go test your circulation first and let me know what you find. Oh yeah, when you do the circulation test, turn your heater in the car on full blast too...does it get hot inside the car?

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Hi and thanks, i have chev optra 1800 auto 2004 model, just had head machined head gasket replaced, still overheated, replaced a very corroded radiator, now first drive has slight overheating, should i...


Before you replace the water pump, take a look at the thermostat. In fact, just for a test, take it out. and run without one. The worst thing that will happen is the engine will run a little cool and use more fuel in the first few miles as a result, but if this happens, you can be fairly certain you have a faulty thermostat. It may even be that when you expose the thermostat you see some debris restricting the water flow.

Water pumps usually need replacing because they leak, rather than because they are not pumping water. I would consider that as a very last resort

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Obviously the engine is overheating.
Could be a struck thermostat --- that would show up within about 5-10 mins. of running in the driveway in neutral. You did put a new thermostat with the head work ? Did you bleed out the cooling system when filling????.
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