Question about Chevrolet Impala

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Noticed temp gauge running a little higher than normal.cooling fans turn on and off very quickly. turned on ac and the fans run. trying to diagnose without getting taken to the cleaners from the dealer 2005 impala 3800 Had a great GM mechanic friend whom just passed away, that guy i could trust thermostat was changed 8 months ago

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  • Chevrolet Master
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Check your coolant levels. If the temperature isn't much higher than normal, you may be fine, or you may have a Coolant Temperature Sensor going bad, and reporting the incorrect temperature. Even though the thermostat was replaced 8 months ago, it is possible it is already going bad again. I believe this is more of a Coolant Temp. Sensor fault though. The cooling fans are On when the AC is on. With the AC off, the cooling fans come on when the engine reaches a certain temperature, and cut off once the temperature is back in range. The Coolant Temperature sensor shouldn't cost much, and is easy to replace. I would start with that, top it off with coolant, and then maybe change the thermostat.

Posted on Mar 14, 2011

Testimonial: "Thanks for the quick reply, is it an easy DIY or should I take it to the dealer?"

  • 1 more comment 
  • markofperfec Mar 14, 2011

    Thanks for the quick reply, is it an easy DIY or should I take it to the dealer?

  • Jeremy Moore
    Jeremy Moore Mar 14, 2011

    It is easy to change the Coolant Temp. Sensor, it is usually located near the Thermostat Housing and screws out using an open-end wrench, or similar. It should have 2 wires, but some have 1 wire.

  • markofperfec Mar 14, 2011

    thanks again - i debating on attempting because of the location and tight space plus the antifreeze spilling all over - dealer wants around a buck and a half to repair - my buddy probably would've charged $50 or so may he rest in peace

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