Chevrolet Chevy Express G1500 (1996-2012) Manual a/c circuit, passenger van

A/C HIGH PRESSURE SWITCH AUXILIARY HVAC CONTROL PROCESSOR (BEHIND AUXILIARY HVAC ASSEMBLY, IN HEADLINER) BLK WIRE BLOW FUSE 51 BLOWER MOTOR (RIGHT REAR OF ENGINE COMPT) BLOWER MOTOR RESISTOR ASSEMBLY (RIGHT REAR OF ENGINE COMPT) BODY FUSE BLOCK (BELOW LEFT FRONT SEAT) BREAKOUT) BREAKOUT) (W/O RV UPFITTER OPTION: IN FRONT HEADLINER HARN, BRN WIRE BRN/WHT WIRE DEFOGGER SYSTEM DK BLU WIRE DK GRN/WHT WIRE EXCEPT RV FRONT AUXILIARY HVAC CONTROL ASSEMBLY GRY WIRE HOT AT ALL TIMES HOT IN HVAC 1 FUSE 9 HVAC CONTROL ASSEMBLY HVAC FUSE 10 LOGIC LT BLU WIRE LT GRN WIRE MED OFF OFF LO MED HI OFF MAX NORM BI-LEV ORG/ WIRE PNK/BLK WIRE PPL PPL/WHT WIRE R DEFOG IND GROUND ING 3 BATTERY REAR REAR AUXILIARY HVAC CONTROL ASSEMBLY RED WIRE RED/BLK (OR RED) WIRE RED/WHT WIRE RR BLOWER FUSE 13 RUN WIRE TAN WIRE UNDERHOOD FUSE BLOCK (LEFT SIDE OF ENGINE COMPT) VENT HEAT HEAT/DEF DEF VENT HEAT HEAT/DEF DEF OFF MAX NORM BI-LEV WHT WIRE YEL WIRE

BLK WIRE BLOWER MOTOR (ON RIGHT REAR OF ENGINE COMPT, ON EVAPORATOR CASE) BLOWER MOTOR RELAY BODY FUSE BLOCK (UNDER LEFT FRONT SEAT) BREAKOUT) BRN WIRE BRN/WHT WIRE DEFOGGER SWITCH DEFOGGER IND DEFOGGER SYSTEM DK BLU WIRE DK GRN/WHT WIRE FLOOR MIX BLEND DEF MAX A/C OFF A/C BI-LEV FRONT AUXILIARY HVAC CONTROL ASSEMBLY FRT BLWR FUSE 74 GND IGN GRY WIRE HOT AT ALL TIMES HOT W/ RUN/ HVAC 1 FUSE 14 HVAC 2 FUSE 13 HVAC CNTRL FUSE 25 HVAC CONTROL ASSEMBLY INTERIOR LEFT REAR OF ENGINE) (4.3L: RIGHT REAR OF ENGINE) LIGHTS SYSTEM LOGIC 2 1 LT BLU WIRE LT GRN WIRE MAX A/C OFF A/C BI-LEV VENT MED OFF ORG/ WIRE PNK/BLK WIRE PPL PPL/WHT WIRE REAR REAR AUXILIARY HVAC CONTROL ASSEMBLY REAR BLWR FUSE 29 REAR DUAL SIG CTRL REAR DUAL CTRL RED WIRE RED/BLK WIRE RED/WHT WIRE SPLICE BLOCK TAN WIRE UNDERHOOD FUSE BLOCK (ON LEFT SIDE OF ENGINE COMPT) VACUUM PUMP (6.6L) (RIGHT FRONT OF ENGINE COMPT, UNDER BATTERY) VENT FLOOR DEF MIX BLEND W/ ELECTRIC REAR WINDOW DEFOGGER, POWER MIRRORS W/ RV UPFITTER W/O RV (ATTACHED TO LOWER RIGHT "B" PILLAR PART OF UPFITTER W/O RV UPFITTER W/O RV W/ RV UPFITTER UPFITTER WHT WIRE YEL WIRE

A/C COMPRESSOR CLUTCH A/C FUSE 32 A/C LOW PRESSURE SWITCH (ON SIDE OF ACCUMULATOR) A/C RELAY 54 AUXILIARY AIR TEMPERATURE ACTUATOR AUXILIARY BLOWER MOTOR (LEFT REAR OF PASSENGER AUXILIARY BLOWER MOTOR RESISTOR AUXILIARY MODE ACTUATOR (LEFT REAR OF PASSENGER COMPT) BLK WIRE BRN WIRE CLUTCH RLY CTRL COMPT, ON AUXILIARY HVAC ASSEMBLY) DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE GRY WIRE HARN, 32 CM FROM HOT AT ALL TIMES HOT IN RUN OR START IGN E FUSE 22 LOW PRESS SIG LT BLU WIRE ORG/ WIRE POWERTRAIN CONTROL MODULE (PCM) (ON LEFT FRONT INNER FENDER) PROVISIONAL RED/WHT WIRE REQUEST SIG UNDERHOOD FUSE BLOCK (LEFT SIDE OF ENGINE COMPT) WHT WIRE YEL WIRE

2501 2500 2501 2500 COMPUTER DATA LINES SYSTEM A/C LOW PRESSURE SWITCH (ON SIDE OF ACCUMULATOR) AUXILIARY AIR TEMPERATURE ACTUATOR AUXILIARY BLOWER MOTOR (ON AUXILIARY HVAC) AUXILIARY BLOWER MOTOR MEDIUM SPEED RELAY AUXILIARY BLOWER MOTOR RESISTOR ASSEMBLY (ON AUXILIARY AUXILIARY HVAC MODULE) AUXILIARY MODE ACTUATOR BATT GND BLK WIRE BLK/WHT WIRE BLOWER MOTOR BREAKOUT) BREAKOUT) BRN WIRE COMPUTER DATA LINES SYSTEM COOLANT HEATER BLOWER MOTOR COOLANT HEATER COMBUSTION SENSOR COOLANT HEATER CONTROL MODULE COOLANT HEATER GLOW PLUG COOLANT HEATER OVERHEAT TEMPERATURE SENSOR COOLANT HEATER AIR TEMPERATURE SENSOR COOLANT HEATER TEMPERATURE SENSOR DK BLU WIRE DK BLU/LT GRN WIRE DK GRN WIRE DRIVER INFORMATION CENTER (DIC) DISPLAY ENGINE COOLANT LEVEL SWITCH ENGINE COOLANT TEMPERATURE GAUGE FOH MDL FUSE 35 FROM AUXILIARY BLOWER MOTOR CONNECTOR BREAKOUT) FUEL PUMP GND SERIAL - SERIAL + SERIAL - SERIAL + GRN/RED WIRE GRY WIRE HEATER MOTOR HOT AT ALL TIMES INSTRUMENT PANEL CLUSTER (IPC) LOGIC LOGIC COOLANT LEVEL SW SIG LOW REF LOW SPD GMLAN SERIAL DATA LT BLU WIRE LT GRN WIRE ORG/ WIRE PROVISIONAL RED/WHT WIRE SERIAL DATA TAN WIRE TAN/BLK WIRE UNDERHOOD FUSE BLOCK (ON LEFT SIDE OF ENGINE COMPT) VOLT WHT WIRE YEL WIRE

19 21 69 14 71 CTRL SPD SIG CTRL SPD SIG SPEED SIG 24 40 58 4 21 22 SENS SIG LOW REF 59 36 63 66 46 25 8 65 43 44 12 13 34 28 27 PRESS SENS LOW REF 6.6L 4.3L 4.8L, 5.3L, 6.0L A/C CMPRSR FUSE 18 A/C CMPRSR RELAY 40 A/C COMPRESSOR CLUTCH A/C REFRIGERANT PRESSURE SENSOR A/C SERIAL REQUEST DATA SIG BLK WIRE BODY CONTROL MODULE (BCM) (BEHIND LOWER RIGHT SIDE OF DASH) BRN/WHT WIRE CLUTCH RLY CTRL COMPUTER DATA LINES SYSTEM COOLING FAN ASSEMBLY (6.6L) (BEHIND RADIATOR) DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE ENGINE CONTROL MODULE (ECM) ENGINE COOLANT TEMPERATURE (ECT) SENSOR FAN CLTCH (EV) FUSE 63 GMLAN - GMLAN + GMLAN DATA GRY WIRE HOT AT ALL TIMES HOT W/ PWR/TRN RELAY 49 ENERGIZED LOW REF LT BLU WIRE LT GRN WIRE OF ENGINE) ORG/BLK WIRE PNK WIRE REF SIDE OF ENGINE COMPT) TAN WIRE TAN/BLK WIRE UNDERHOOD FUSE BLOCK (ON LEFT W/ AUXILIARY FUEL FIRED HEATER W/O AUXILIARY FUEL FIRED HEATER W/O AUXILIARY FUEL FIRED HEATER W/ AUXILIARY FUEL FIRED HEATER WHT/BLK WIRE YEL WIRE