Question about 2003 Chevrolet Impala

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The temp gauge on my 2003 chevy impala is pegged hot when idling, but goes down as I drive. Is this a thermostat problem?

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  • Richard Scordino May 11, 2010

    Likely not a thermostat ...check that the electric fan is operating and that you don't have a partially plugged or externally obstructed radiator.

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The most probable cause is air in the system. If all fans kick on then it can only be air in the system or problem would accure when driving too. A pocket of air will cause a small vortex and it take far more pressure to get anything around it. Like fluid. To burp the system....when your car is cooled off, remove the radiator cap and then start it up....it will push all the air out the top and you will see bubbles and maybe even some fluid shoot out. Just make sure you add back to correct levels when all done. This running process has taken me as long as 30 mins to get all the way out. Its easy and free but DO keep an eye on the temp guage while the cars just idealing to get the air out.

Posted on Oct 24, 2009

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I dont think the thermostat , most likely your water pump

Posted on May 31, 2009

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