1981-87 CHEV PICK-UP - Vintage Air

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OPERATION OF CONTROLSNOTE: WHEN BATTERY POWER IS FIRST CONNECTED TO THE ECU, THE MICRO PROCESSOR GOES THROUGH AN INITIALIZATIONSEQUENCE.THIS INITIALIZATION MAY TAKE UP TO 30 SECONDS. DURING INITIALIZATION THE BLOWER WILL NOT OPERATE,BUT THE DOORS INSIDE THE UNIT WILL BE OPERATING. A LOW BATTERY OR DISCONNECTING THE BATTERY MAY ALSOTRIGGER A RE-INITIALIZATION. DURING START UP, A LOW BATTERY MAY DROP BELOW 7 VOLTS, TRIGGERINGRE-INITIALIZATION.AC MODEMODELEVEROFF HI BLOWERSPEEDDASH FLR DEFHOTCOLDA/CBLOWER SPEEDADJUST TO DESIREDSPEEDMODE LEVERSLIDE THE LEVER TOTHE LEFT POSITIONHEAT MODETEMPERATURE LEVERIN A/C MODE SLIDE THETEMPERATURE LEVER ALLTHE WAY TO THE RIGHTTO ENGAGE COMPRESSOR.(SLIDE LEVER LEFT OR RIGHTTO ADJUST DESIREDTEMPERATURE)TEMPERATURELEVEROFFHIDASH FLR DEFHOTCOLDA/CBLOWER SPEEDADJUST TO DESIREDSPEEDMODE LEVERSLIDE THE LEVER TOTHE CENTER POSITIONTEMPERATURE LEVERSLIDE THE TEMPERATURELEVER ALL THE WAY LEFTTO THE HOT POSITION.(SLIDE LEVER LEFT OR RIGHTTO DESIRED TEMPERATURE)DEFROST/ DE-FOG MODEOFFHIDASH FLR DEFHOTCOLDA/CBLOWER SPEEDADJUST TO DESIREDSPEEDMODE LEVERSLIDE THE LEVER TOTHE RIGHT POSITIONTEMPERATURE LEVERADJUST LEVER TODESIRED TEMPERATURE.(COMPRESSOR ISAUTOMATICALLYENGAGED)901182 REV A 6/13/11, INST 81-87 CHEV P-UP wo AC EVAP KIT PG 22 OF 2722
23TROUBLE SHOOTING INFORMATIONSYMPTOM CONDITION CHECKS ACTIONS NOTESVERIFY ALL PINS ARE INSERTED INTO PLUG. INSURE NOPINS ARE BENT OR DAMAGES IN ECU.NO OTHER FUNCTIONS WORK1. BLOWER STAYS ON HIGHSPEED WHEN IGNITION IS ONLOSS OF GROUND ON THIS WIRE RENDERCONTROL HEAD IN OPERABLEVERIFY CONTINUITY TO CHASSIS GROUND WITH WHITECONTROL HEAD WIRE AT VARIOUS POINTSSEE BLOWER SWITCH CHECK PROCEDURECHECK FOR DAMAGED PINS OR WIRES IN CONTROLHEAD PLUG.CHECK FOR DAMAGED GROUND WIRE (WHITE) INCONTROL HEAD HARNESS.CHECK FOR DAMAGED BLOWER SWITCH OR POTAND ASSOCIATED WIRING.ALL OTHER FUNCTIONS WORKBE SURE SMALL, 20 GA WHITE GROUND WIRE ISCONNECTED TO THE BATTERY GROUND POST. IF IT IS,REPLACE ECU.UNPLUG 3 WIRE BSC CONTROL CONNECTORFROM ECU. IF BLOWER SHUTS OFF, ECU IS EITHERIMPROPERLY WIRED, OR DAMAGED.BLOWER STAYS ON HIGHSPEED WHEN IGNITION IS ONOR OFFCHECK TO INSURE THAT NO BSC WIRING IS DAMAGEDOR SHORTED TO VEHICLE GROUND. THE BSC OPERATESTHE BLOWER BY GROUND SIDE PWM SWITCHING. THEPOSITIVE WIRE TO THE BLOWER WILL ALWAYS BE HOT.IF THE “GROUND” SIDE OF THE BLOWER IS SHORTED TOCHASSIS GROUND, THE BLOWER WILL RUN ON HI.UNPLUG 3 WIRE BSC CONTROL CONNECTORFROM ECU. IF BLOWER STAYS RUNNING, THE BSCIS EITHER IMPROPERLY WIRED, OR DAMAGED.NO OTHER PART REPLACEMENTS SHOULD BENECESSARYREPLACE BSC. (THIS WILL REQUIRE EVAPORATOR TO BEREMOVED FROM VEHICLE.)DANGER- NEVER BYPASS SAFETY SWITCH WITHENGINE RUNNING, SERIOUS INJURY CANRESULT.SYSTEM IS NOT CHARGED SYSTEM MUST BE CHARGED FOR COMP. TOENGAGE2. COMPRESSOR WILL NOT TURNON (ALL OTHER FUNCTIONSWORK)901182 REV A 6/13/11, INST 81-87 CHEV P-UP wo AC EVAP KIT PG 23 OF 27CHARGE SYSTEM OR BYPASS PRESSURE SWITCH.TO CHECK FOR PROPER POT FUNCTION, CHECKVOLTAGE AT WHITE/ BLUE WIRE. VOLTAGESHOULD BE BETWEEN 0 AND 5V, AND WILL VARYWITH POT LEVER POSTION.CHECK CONTINUITY TO GROUND ON WHITE CONTROLHEAD WIRE. CHECK FOR 5V ON RED CONTROL HEADWIRE.CHECK FOR FAULTY A/C POT OR ASSOC. WIRING(NOT APPLICABLE TO 3 POT CONTROLSDISCONNECTED OR FAULTY THERMISTOR WILLCAUSE COMPRESSOR TO BE DISABLED.CHECK TWO PIN CONNECTOR AT ECU HOUSINGCHECK FOR DISCONNECTED OR FAULTYTHERMISTOR.RED WIRE @ A/C POT SHOULD HAVE APPROX. 5VWITH IGNITION ON. WHITE WIRE WILL HAVECONTINUITY TO CHASSIS GROUND, WHITE/ BLUEWIRE SHOULD VARY BETWEEN 0V AND 5V WHENLEVER IS MOVED UP AND DOWN.CHECK FOR FAULTY A/C POT OR ASSOC. WIRING REPAIR/REPLACE POT/ CONTROL WIRING3. COMPRESSOR WILL NOT TURNOFF (ALL OTHER FUNCTIONSWORK)REPLACE RELAYCHECK FOR FAULTY A/C RELAY
Page 4 and 5: FOR MAXIMUM SYSTEM PERFORMANCE VINT
Page 6 and 7: ENGINE COMPARTMENTBEFORE STARTING T
Page 8 and 9: DEFROST DUCT INSTALLATIONINSTALL (4
Page 10 and 11: BRACKET & EVAPORATOR HARDLINE INSTA
Page 12 and 13: EVAPORATOR INSTALLATIONLIFT EVAPORA
Page 14 and 15: HEATER HOSE & HEATER CONTROL VALVE
Page 16 and 17: PASSENGER SIDE LOUVER DASH PANEL IN
Page 18 and 19: GLOVE BOX MODIFICATIONUSE GLOVE BOX
Page 20 and 21: WIRING DIAGRAM232007-VURJF8TANORABL
Page 24 and 25: TROUBLE SHOOTING INFORMATION CONT.4
Page 26 and 27: GLOVE BOX MODIFICATION TEMPLATE73-8

1981-87 CHEV PICK-UP - Vintage Air

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