A/C - Whistling Noise When in Recirculate Mode

Bulletin Number: 93-10-13
Reference Number: 200106
Publish Date: 12/92

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

Models Affected:
1992-93 BONNEVILLE SE, PONTIAC SSE, SSEi

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 F). 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 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 currently available from GMSPO.

WARRANTY INFORMATION:

Labor Operation No.: T5320
Labor Time: 0.2 hr.