Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
Hi my name is***** will be glad to try to help. First lets try this procedure.
Here is how to do the recalibration.
Important: The scan tool must be disconnected from the vehicle to properly perform the calibration procedure. If a scan tool is connected before this procedure is completed, then new calibration values will not be stored.
Important: Failure to wait 60 seconds will not allow the HVAC control module sufficient time to clear the old calibration values.
Let me know if this re-calibration procedure works and the fault does not return active.
It is possible you have a leaky system or other problems.
Check the lines and fittings for signs of oily residue indicating a leak. if found the leak needs to be repaired and the system properly recharged.
Hook a manifold AC gauge set onto the vehicle and see what you have in the system for pressures to check for low system charge.
If the charge is ok then check all your fuses and the harness to the AC compressor and the pressure and temp switches for problems
The A/C light is designed to flash and disallow A/C operation if any of the following conditions are present:
Ambient air temperature (AAT) is too cold (35 degrees or colder)Vehicle system voltage is less than 9.5 voltsRefrigerant pressure is too lowRefrigerant pressure is too highEngine coolant temperature (ECT) is too highEngine is not in RUNHVAC Control Head is in the OFF position