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Does anyone know what the OEM HVAC control part number is/was for a 2002 C5 coupe? What are the upgraded part numbers if any? My car has the dual auto controls and it stopped working. No display, no air, nothing. I bought another control unit off of ebay but I noticed it was a different part number and still no HVAC display or function. But they both will light up (Back lit). Even tried the buick HVAC controller and still no display, no blower, nothing. I replaced the blower motor resister module, checked all fuses, replaced relays, and cleaned grounds. Nothing. At a loss of the next step to get any air moving in the car. Appreciate any input.
I would check with a dealership for the latest part number…I’d never buy something like an HVAC Control Module off EBay…any trouble codes in the HVAC module ??…I’d check the modules powers and grounds…if this testing is over your head you can head over to Royalty Auto Service southwest of you in St. Mary’s or Kingsland…they will diagnosis it correctly…you said you checked the grounds…G202 at the bottom of the A pillar is the HVAC Module ground…you check that ??
Does anyone know what the OEM HVAC control part number is/was for a 2002 C5 coupe? What are the upgraded part numbers if any? My car has the dual auto controls and it stopped working. No display, no air, nothing. I bought another control unit off of ebay but I noticed it was a different part number and still no HVAC display or function. But they both will light up (Back lit). Even tried the buick HVAC controller and still no display, no blower, nothing. I replaced the blower motor resister module, checked all fuses, replaced relays, and cleaned grounds. Nothing. At a loss of the next step to get any air moving in the car. Appreciate any input.
Sounds like the parts cannon is out of ammo. What about 12v and ground checks with a DMM?
2002 Coupe HVAC controller part number and issues
