A/C - Compressor Growl
Number 85-1-9 Date 7/85Subject: AIR CONDITIONING COMPRESSOR GROWL
1985 GRAND AM WITH V-5 COMPRESSOR
Condition:
Air conditioning compressor will make a pumping noise during idle and low speed road conditions with the A/C "ON".. The sound generally comes from the engine compartment and can be heard in the passenger compartment as a growl sound.
During maximum cooling demand (high ambient temperatures, "norm" A/C mode selection, and after high blower fan use), compressor pulsation noise is more pronounced.
A/C REFRIGERANT LINE:
NOTE: Refer to Dealer Service Bulletin 85-1-4A for a "hiss noise" correction. To determine if the hiss correction has been performed on the car, inspect the condenser outlet evap. inlet tube assembly for an enlarged tube section (see illustration).
Cause:
Compressor pumping of refrigerant results in pressure pulses that are transmitted in the suction and discharge hose assemblies.
Correction:
1. Remove and discard condenser and compressor hose assembly (P/N 10034421) and O-rings.
2. Install new condenser and compressor hose assembly (includes revised discharge muffler and suction muffler), P/N 10039911. Use refrigerant lube on O-rings (part of new hose assembly) and torque compressor end fitting bolt to 26-40 N-m (19-29 ft.lbs.), torque bolts for the block joints to 12 N-m (9 ft.lbs.) on the condenser end, and 17 N-m (12 ft.lbs.) on the evaporator (dash) end.
3. Evacuate and recharge. Use 1.02 kg (2.25 lbs.) of R-12 refrigerant.
Warranty Information
When this bulletin work is performed in conjunction with Dealer Service Bulletin 85-1-1A, labor time for system recharging is included in T3136.
T3136 D3066
1.5 hrs. 0.2 hrs.