Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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I have had heater actuators cause this problem.
The heater system does a re-calibration on the actuator when you shut it off. When the actuator can't zero themselves they start to tick or knock.
If you look up by the gas pedal you can see the temp actuator. When you hear the noise you should see it clicking.
If so need to replace the actuator.
Just make sure the noise is coming from the actuator. There is three more on the left side (passenger side)
What are you changing?
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A picture and instructions
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