When I change my thermostat from cold to hot or vis verser, it makes a knocking noise for about 15 seconds and then stops.

Asked by Oct 29, 2016 at 05:26 PM about the 2007 Chevrolet Impala LS

Question type: Maintenance & Repair

Either going from hot to cold or cold to hot, it knocks.

1 Answer

79,125

Sounds like a bad temperature door actuator under the dash. HTH. -Jim

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