HISS NOISE-AIR CONDITIONING CONDENSER TUBE

Models Affected: 1985 Somerset Regal

NOTICE: This bulletin supersedes 85-1-15 dated February 1985 for text correction. Please discard original bulletin and replace it with this one.

CONDITION:

---------- Air conditioning system mayy make a 'hiss' noise during idle and low speed conditions with the A/C "on". The sound generally comes from the center of the instrument panel and through the air outlets. The noise may not occur during highest ambient temperature conditions. Affected vehicles: prior to VIN 401300).

CAUSE:

------- Refrigerant flowing through the orifice located in the evaporator inlet tube at the dash is the source of the 'hiss'.

CORRECTION:

1. Follow procedure outlined in Section 1B, Air Conditioning, 1985 Chassis Service Manual for discharging system.

2. Remove the orifice in the evaporator inlet tube at the dash pass-thru location and discard. Discard the forward clip.

3. Remove the condenser outlet-evap inlet tube assembly (P/N 10031683). Discard, and replace with P/N 10038431, Tube and Orifice Assembly. Use refrigerant lube on 0-rings and torque bolts to 12 N.m (9 lb.-ft.) on the condenser end and 17 N.m (12 lb.-ft.) on the evaporator (dash) end. Rear tube clip must be reinstalled.

4. Evacuate and recharge.

WARRANTY INFORMATION

Labor Operation: T3136 Labor Time: 1.5 Hrs (Includes System Recharge) Trouble Code: 92

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.