V-5 A/C COMPRESSOR FRT. HEAD TO CYL. O- RING. Pontiac 6000 1985

For 1990-2009 cars

# V-5 A/C COMPRESSOR FRT. HEAD TO CYL. O- RING

#### Subject: SERVICING OF V-5 AIR CONDITIONING COMPRESSOR 1986 J2000 1.8L (VIN CODE 0) 1985-86 GRAND AM 2.5L (VIN CODE U) 1986 6000 2.5L (VIN CODE R) 1986 FIERO 2.BL (VIN CODE R)

"Please discard bulletin 86-1-2, dated 6186, due to this updated information."

The return program involving V-5 air conditioning compressors terminated September 1, 1985. Some service compressors, however, still contain information regarding the return program. This return information should be disregarded.

When repairing the V-5 compressor, it is suggested that you use the diagnostics contained in the 1986 Service Manual. The 1986 diagnostics are improved over the 1985 Service Manual, but will also pertain to the 1985 model. It is suggested that a notation be made in your 1985 Service Manual to refer to the diagnostic charts on Pages 1B-7 thru 1B-10 of the 1986 Service Manual.

A number of compressors have been replaced that only have a defective control valve. An additional diagnostic procedure for evaluating inadequate system cooling due to the control valve follows:

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 ignition in on position 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 F (10 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 auxillary 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.

#### COMPRESSOR PART NUMBER CHART

HARRISON GMWDD PART NUMBER PART NUMBER MODEL USAGE ----------- ----------- -----------

1986 J2000 1131543 12323441 1.8 Engine (0)

1985-86 Grand Am 1131441 12322146 2.5 Engine (U)

1986 Fiero & 6000 1131515 12323436 2.5 Engine (R)

#### V-5 COMPRESSOR SERVICE PARTS LIST

COMPRESSOR MODEL NO. PART NO. PART NO. (STAMPED ON COMPRESSOR-SERVICE QTY W/O CLUTCH W/CLUTCH COMPRESSOR) ------------------ --- ---------- -------- ------------

85-86 Models W/2.5L Engine (U & R) 1 2724327 12322146 1131441 (U) 12323436 1131515 (R)

86 Models W/1.8L Engine (0) 1 2724345 12323441 1131543

Head, Compressor, Rear, Kit - 2 Switch Type 2724329 All Includes: Head Rear (NAS) 1 O-Ring, Head 1 6557662 Gasket, Bolt (NAS) 6 Gasket, Rear Head (NAS) 1 O-Rings Kit, Control Valve 1 Ring, Retainer-Switch 2 O-Ring, Switch 2 Instruction Sheet (NAS) 1

O-Rings & Retainer-Control Valve Kit 2724330 All Includes: O-Rings 4 Ring, Retainer 1

#### NOTE: NAS - NOT AVAILABLE SEPARATELY

#### V-5 COMPRESSOR SERVICE PARTS LIST

COMPRESSOR MODEL NO. PART NO. PART NO. (STAMPED ON COMPRESSOR-SERVICE QTY W/O CLUTCH W/CLUTCH COMPPRESSOR) ------------------ --- ---------- -------- ------------ O-Ring, Rear Head 1 6557662 All

Control Valve Assembly Kit 2724331 All Includes: Control Valve Assembly (NAS) 1 Ring Retainer 1

Thru Bolts and Gasket Kit 2724332 Includes: Thru Bolts (NAS) 6 Bolt Gasket 6

Gasket Thru Bolts 6 6557379 All

Plug & Washer Assy. Drain 1 6557638 All

Seal, Shaft Kit 2724319 All Includes: 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

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.