Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
Hi there, can I confirm that your drivers side is the one that is malfunctioning, and if so then it sounds like the typical failure of the actuator.
Usually all that is required is the system needs to be re-calibrated 3 times to clean the feedback circuit in the actuator off. This is done by removing the battery for 10 seconds. Attach the battery then start the engine for 3 mins. Shut the engine off and then repeat this 2 more times.
If this does not correct the issue, then we need to replace the actuator. You can use the direction in the document attached.
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With that many miles it could be the control head. Usually though the actuator is the issue as it has a feedback circuit inside that gets dirty and when it looses its position, it defaults to the full hot. I am not sure what you used for a replacement, but my experience with aftermarket parts on this has not been the most positive. So I guess I am saying that unless you bought GM or AC Delco parts, I would not rule out the actuator. The second thing is to update the firmware in the heater control head (through Dealer programming) in which case it changes the operating characteristics to keep that feedback circuit clean.
Yes it would. Knowing you bought the AC Delco, try the recalibration I listed and evaluate it for a couple days then we can see if it needs more.
On is fine. It does this automatically.
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That is very strange. The passengers side operates properly?
And the actuator you are changing is on the bottom of the heater case, very bottom just right of centre?
Yes, take out the HVAC ECAS fuse, wait 10 second, put it back in, start the engine. Wait 5 mins. Repeat for a total of 3 times. Does not matter what setting the heater is on. It will force the recalibration.
How did that work?