For 1990-2009 cars

# V5 A/C COMPRESSOR SERVICEABILITY PART NUMBERS

THIS INFORMATION BULLETIN IS ISSUED TO ALERT CHEVROLET DEALERS THAT THE HARRISON RADIATOR V5 VARIABLE DISPLACEMENT COMPRESSOR IS RELEASED AS A SERVICEABLE UNIT SINCE THE BEGINNING OF THE 1986 MODEL YEAR. THE RETURN PROGRAM USED DURING THE 1985 MODEL YEAR HAS ENDED AND ANY COMPRESSOR FOUND WITH THE RETURN INFORMATION INCLUDED SHOULD BE DISREGARDED. CURRENTLY THIS TYPE OF COMPRESSOR IS BEING INSTALLED ON CERTAIN APPLICATIONS ON CELEBRITY AND CAVALIER MODELS. ATTACHED IS A SERVICE PARTS LIST FOR THE FIVE V5 COMPRESSOR MODELS CURRENTLY RELEASED ALONG WITH A LABELED EXPLOSION VIEW. ALSO ATTACHED IS A DIAGNOSTIC PROCEDURE FOR EVALUATING INADEQUATE SYSTEM COOLING DUE TO THE CONTROL VALVE FOUND IN THIS TYPE OF COMPRESSOR. REPLACEMENT OF THE CONTROL VALVE SHOULD BE CHARGED TO LABOR OPERATION D4205.

#### V-5 COMPRESSOR SERVICE

COMPRESSOR- P/N P/N COMPRESSOR MODEL # SERVICE QTY. W/O CLUTCH W/CLUTCH (STAMPED ON COMPRESSOR) 1985-86 CALAIS AND CUTLASS CIERA MODELS W/2.5L ENGINE 1 2724327 12322146 1131441 12323436 1131515 1985-86 FIRENZA MODELS W/2.0L ENGINE 1 2724328 12322147 1131451

1986 FIRENZA MODELS W/1.8L ENGINE 1 2724345 12323441 1131543

HEAD,COMPRESSOR REAR KIT-2 SWITCH TYPE 2724329 ALL INC: HEAD REAR (NAS) 1 O-RING, HEAD 1 GASKET,BOLT (NAS) 6 GASKET REAR HEAD (NAS) 1 O-RING KIT, CONTROL VALVE 1 RING,RETAINER- SWITCH 2 O-RING,SWITCH 2 INSTRUCTION SHEET (NAS) 1

O-RINGS AND RETAINER- CONTROL VALVE KIT 2724330 ALL INC: O-RINGS 4 RING, RETAINER 1

O-RING, REAR HEAD 1 6557662 ALL

CONTROL VALVE ASSY KIT 2724331 ALL INC: CONTROL VALVE ASSY (NAS) 1 RING, RETAINER 1

THRU BOLTS AND GASKET KIT 2724332 ALL INC: THRU BOLTS (NAS) 6 BOLT GASKET 6

GASKET,THRU BOLTS 6 6557379 ALL

PLUG AND WASHER ASSY, 1 6557638 ALL DRAIN

SEAL, SHAFT KIT 2724319 ALL INC: SEAL,LIP (NAS) 1 O-RING,SEAL SEAT (NAS) 1 RING, RETAINER 1 INSTRUCTION SHEET (NAS) 1

*SWITCH,HPCO (3.0 AMP) KIT 2724333 1131441 1131515 1131543

*SWITCH,HPCO (11.6 MA) KIT 2724335 1131451

*SWITCH,HSLP (3.0 AMP) KIT 2724334 1131441 1131515 1131543

*SWITCH,HSLP (11.6 MA) KIT 2724336 1131451 *ABOVE SWITCH KITS INC: O-RING SWITCH 1 RING RETAINER 1

COIL AND HOUSING ASSY CLUTCH 1 6551997 ALL

PULLEY ROTOR AND BEARING ASSY 1 6551713 ALL

BEARING, PULLEY 1 6557684 ALL

RING,RETAINER- BEARING 1 6555329 ALL

CLUTCH DRIVER ASSY 1 6551920 ALL

KEY,CLUTCH HUB 1 6555320 ALL

NUT,SHAFT 1 6557414 ALL

VALVE,HIGH PRESSURE AND O-RING 1 5914435 ALL

O-RING HPRV (5/PKG.) 1 6555437 ALL

O-RING,SUCTION- DISCHARGE (5/PKG.) 1 5887997 ALL

OIL, 525 VISCOSITY QT 5416939 ALL

NAS NOT AVAILABLE SEPARATELY

HARRISON RADIATOR FIVE CYLINDER VARIABLE DISPLACEMENT AIR CONDITIONING COMPRESSOR - CONTROL VALVE DIAGNOSTICS

INADEQUATE COOLING DUE TO COMPRESSOR CONTROL VALVE

A. CHECK FOR: 1. BLOWN A/C FUSE AND/OR GAGE FUSE. 2. LOOSE OR DISCONNECTED A/C WIRE CONNECTOR. 3. CHECK BLOWER FOR FAN OPERATION. 4. ENGINE COOLING FAN OPERATION - FAN OPERATES IN ALL A/C MODES AS FOLLOWS: A. DISCONNECT ENGINE COOLANT TEMPERATURE FAN SWITCH. B. WITH ENGINE ON AND ENGINE NOT RUNNING, SET A/C CONTROL TO A/C MODE. C. ENGINE COOLING FAN SHOULD RUN. D. RECONNECT ENGINE COOLANT TEMPERATURE FAN SWITCH.

B. CHECK THAT THE COMPRESSOR DRIVE BELT IS NOT LOOSE, MISSING OR DAMAGED AND THAT COMPRESSOR IS NOT SEIZED.

C. WITH AMBIENT TEMPERATURE ABOVE 50 DEGREES F (10 DEGREES C) CHECK FOR COMPRESSOR CLUTCH ENGAGEMENT AS FOLLOWS: 1. ENGINE RUNNING (APPROXIMATELY 1000 RPM). 2. SET A/C CONTROL TO 'NORM' AND 'HIGH' BLOWER. 3. PUT AUXILLIARY FAN IN FRONT OF VEHICLE. 4. OBSERVE CLUTCH OPERATION FOR FIVE MINUTES.

D. IF CLUTCH ENGAGES BUT DOES NOT CYCLE, INSTALL HIGH AND LOW PRESSURE GAGES. IF BOTH GAGES READ WITHIN 10 PSI OF EACH OTHER: 1. DISCHARGE SYSTEM. 2. REMOVE AND REPLACE COMPRESSOR CONTROL VALVE. 3. EVACUATE AND CHARGE SYSTEM. 4. IF PROBLEM PERSISTS, REPLACE COMPRESSOR PUMP ASSEMBLY.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.