HISS NOISE-AIR CONDITIONING CONDENSER TUBE

VEHICLES AFFECTED: 1985 'N' Models Equipped With Air Conditioning

CONDITION:

---------- Air conditioning system may 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 700689).

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 Grand Am 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 ft. lbs.) on the condenser end and 17 N.m (12 ft. lb.) on the evaporator (dash) end. Rear tube clip must be reinstalled.

4. Evacuate and recharge.

Use the most applicable labour operation from the Canadian Labour Time Guide and claim 1.5 hours. (Includes System Recharge),

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.