For 1990-2009 cars

# WHISTLE TYPE NOISE IN RECIRCULATE MODE

#### SUBJECT: WHISTLE TYPE NOISE IN RECIRCULATE MODE - INSTALL CLIP ON RECIRCULATE DOOR

MODEL/YEARS: 1992-93 NINETY EIGHT AND EIGHTY EIGHT

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 45-60 mph (75-100 kph), and may be mistaken for a wind noise from the lower center section of the windshield.

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

This condition affects all 1992-93 Ninety Eight and Eighty Eight models up to the following VIN break- points:

Assembly Plant Series VIN -------------- ------ --- Buick City Eighty Eight PH306500 Wentzville Eighty Eight P1802080 Orion Ninety Eight P4305812

CORRECTION: Install a J-clip, P/N 52466011, which is currently available from GMSPO, 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 vacuum valve 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 1/8 inch (see illustration).

4. Reinstall hush panels.

#### WARRANTY INFORMATION:

Labor Operation No.: T5320

Labor Time: 0.2 hr.

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.