WHISTLE TYPE NOISE IN RECIRCULATE MODE

SUBJECT: WHISTLE TYPE NOISE IN RECIRCULATE MODE (INSTALL CLIP ON RECIRCULATE DOOR)

VEHICLES AFFECTED: 1992-93 "C,H" MODELS

APPLICATION:

----------- All 1992 C/H Models and 1993 C/H models up to the following VIN breaks:

Assembly Plant Division Series VIN -------------- -------- ------ --- Buick City Buick H 423234 Buick City Oldsmobile H 306500 Wentzville Buick C 607098 Wentzville Oldsmobile H 802080 Wentzville Pontiac H 209895 Orion Cadillac C 245051 Orion Oldsmobile C 305812

CONDITION:

--------- A whistling type noise is heard when the air conditioning system is in a recirculate mode. The condition is most prevalent at speeds of 75-100 kph (45-60 mph), and may be mistaken for a wind noise from the lower centre section of the windshield.

To diagnose this condition set A/C controls to "Recirculate" (on automatic systems to "Auto" 60 deg. Fahrenheit or 16 deg. Celsius). Drive the vehicle at 75-100 kph (45-60 mph) and listen for the whistle noise. Turn the A/C controls to "OFF." If whistle stops after the A/C is turned off, then noise is being generated from outside air/recirculate door (air inlet valve).

CORRECTION:

---------- Install a J-clip, P/N 52466011, on the air inlet valve stop using the following procedure:

1. Lower left and right hush panels to gain access to air inlet actuator.

2. Locate the outside air recirculation valve vacuum actuator.

3. Attach clip, P/N 52466011, to actuator "stop" located on the left side of the case to hold valve from being fully closed. Do not fully seat the clip. It should protrude approximately 3 mm. (1/8 inch) (see illustration).

4. Reinstall hush panels.

WARRANTY INFORMATION:

For vehicles repaired under warranty use:

Labour Time: 0.2 hr.

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.