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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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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.

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