WHISTLE TYPE NOISE IN RECIRCULATE MODE

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

MODELS AFFECTED: 1992-93 PARK AVENUE ULTRA AND LESABRE MODELS

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 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 F). Drive the vehicle at 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). VIN breakpoints will be provided when available.

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 1/8 inch (see illustration).

4. Reinstall hush panels.

PARTS STATEMENT:

Parts are expected to be available on December 7, 1992. In case of limited inventory, parts will be placed on 400 control to waive VIP surcharges. Only verifiable emergency VIP orders will be accepted. SPO will make every effort to obtain parts. However, the part will be shipped premium transportation at dealer's expense and all other order types will be placed on backorder until the 400 control is removed.

WARRANTY INFORMATION:

Labor Operation No.: T5320 Labor 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.