![]() ![]() This diagnostic approach was developed for the vehicle with the VIN you entered and should not be automatically be used for other vehicles with similar symptoms. C68 Air conditioning, single-zone automatic climate control. C67 Air conditioning, single-zone manual. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance. PI1174A: Illumination of Rings Around Volume, Menu and Temperature Knobs of Center Stack - bulletin only reflects about the lighted or non-lighted rings around the knobs. The AC also seems to be working/not working off & on. These lights seem to flash for several minutes & then stop. If OFF was last used, then the OFF light flashes when the car is started. Get the best deals on Genuine OEM HVAC Controls & Control Units for Chevrolet Corvette when you shop the largest online selection at. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. When I start my 1990 convertable (automatic) the AUTO light flashes on the climate control display (if AUTO was used prior to shutting off). Please follow this diagnosis process thoroughly and complete each step. The owner should also be advised that turning the key to the off position will clear this condition and allow the HVAC control head to resume normal operation. 17) Remove the capacitor and the two resistors shown in the photo above. 16) Remove the 1/4' screws holding the circuit board into the programmer housing, then remove the board. The owner should be advised to rotate the temperature control knob more slowly to prevent this condition from occurring. 15) Remove the 1/4' nut holding the long bolt in the vacuum line block. Replacing the HVAC control head will not eliminate the occurrence of this condition. 1963-1965 Cable, heater temperature control with blower motor speed switch (without air conditioning) pn: 738976. If this condition exists it should not be considered a faulty HVAC control head. The HVAC control head may not respond to requested temperature changes or it may have warm air blowing out of one side of the dash and cold air out of the other side. When servicing the vehicle with the VIN you entered, the following diagnosis might be helpful if the vehicle exhibits the described symptoms.Ĭorvette (Y-Body) 1997-2003 Heater/Air Conditioning (HVAC) Control Head Does Not RespondĪ condition exists where the HVAC control head may not respond if the temperature control knob is rotated to quickly back and forth from hot to cold. Welcome to GM Parts - your new, consolidated home for GM Genuine Parts and ACDelco parts information and resources. Subject: Service VME - Heater Air Conditioning (HVAC) Control Head Does Not Respond - DTC electrical #PI01003: Service VME - Heater Air Conditioning ( HVAC ) Control Head Does Not Respond - DTC electrical - (Apr 9, 2003)
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