Shop OEM General Motors Part # 42906887 (87824147). Case Assembly - Heater and Air Conditioning (A/C) Evaporator. 2nd design, labeled: 42906887. AIR CONDITIONER and HEATER. EVAPORATOR and

1ST design. 2ND design. At evaporator. At harness. Inlet valve. Labeled: 42906887. Labeled: 87824147. Lower. Mode valve. Temp valve. Upper. W/AUTO temp ctrl. W/O auto temp ctrl. W/O rear vent. W/REAR vent.

2nd design. labeled: 42906887.