GMC Cab & Chassis K2500 (1989-2000) A/c circuit

1 2 3 4 5 6 7 8 9 10 ILLUMINATION GROUND A/C DISABLE AUX FAN CTRL IGNITION A/C COMPRESSOR CLUTCH A/C COMPRESSOR CLUTCH CYCLING SWITCH (IN LOW PRESSURE LINE NEAR COMPRESSOR) A/C COMPRESSOR CLUTCH RELAY (IN UNDERHOOD FUSE/RELAY CENTER) A/C CTRL A/C HIGH PRESSURE CUTOUT SWITCH (AT A/C COMPRESSOR) A/C MAXI FUSE 3 CENTER A/C REQ AUX FAN MINI FUSE AUXILIARY COOLING FAN A/C PRESSURE SWITCH AUXILIARY COOLING FAN MOTOR AUXILIARY COOLING FAN RELAY (7.4L VIN J) (IN UNDERHOOD FUSE/RELAY CENTER) BATTERY IGNITION GROUND DEFOGGER ELEMENT BLK WIRE BLOWER MOTOR BLOWER RESISTOR (UNDER RIGHT SIDE OF I/P, ON HEATER HOUSING) BLOWER SWITCH BRN WIRE DIODE DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE GAS DIESEL GRY WIRE GRY/BLK WIRE HEATER AND A/C CONTROL MODULE HIGH BLOWER RELAY (UNDER I/P ON TOP OF HEATER-A/C CASE) HOT AT ALL TIMES HOT IN RUN HOT IN RUN OR START IGN MINI FUSE A/C COMP MINI FUSE HOT IN RUN, BULB TEST OR START FUSE BLOCK HTR A/C FUSE 12 IGN E MINI FUSE LT BLU WIRE LT GRN WIRE NCA WIRE OFF LO ORG/ WIRE PNK WIRE PPL REAR DEFOGGER SYSTEM RECIRCULATION DOOR MOTOR (UNDER I/P ON HEATER- A/C CASE) RED WIRE TAN WIRE UNDERHOOD FUSE-RELAY UNDERHOOD FUSE-RELAY CENTER VALVE CTRL AIR TEMP DR SENSOR MODE SIGNAL A/C SWITCH WATER VALVE (SUBURBAN, UTILITY, CREW CAB ONLY) (RIGHT CENTER OF INTAKE AREA) WHT WIRE YEL WIRE