A/C - Module Emits a `Tick-Tock' Noise

File In Section: 01 - HVAC

Bulletin No.: 01-01-38-007

Date: May, 2001

TECHNICAL

Subject:
Tick-Tock Noise From HVAC Module Assembly (Install Spring)

Models:
1997-1999 Buick Park Avenue, Ultra with RPO CJ2
2000-2001 Buick LeSabre with RPO C67
2000-2001 Pontiac Bonneville with RPO C61

Condition

Some customers may comment that the Heater and Air Conditioning (HVAC) Module Assembly emits a repeating "tick-tock" noise.

Cause

The "tick-tock" noise may be due to the two air mix (temperature) actuators on the Park Avenue HVAC module and the mode and air mix (temperature) actuators on the Bonneville and LeSabre HVAC module oscillating/cycling when they have reached a position on the HVAC module.

Correction

Install a deflector spring, P/N 25732764, in the covers of the two air mix (temperature) actuators on the Park Avenue HVAC module and in the covers of the mode and air mix (temperature) actuators on the Bonneville and LeSabre HVAC module.

1. PARK AVENUE:

Remove the two air mix (temperature) actuators from the HVAC module assembly. Refer to the Air Mix Actuator - Driver and the Air Mix Actuator - Passenger replacement procedures in the HVAC Systems - Automatic sub-section of the Service Manual.

BONNEVILLE AND LESABRE:

Remove the mode and air mix (temperature) actuators from the HVAC module assembly. Refer to the Mode Actuator and the Temperature Actuator replacement procedures in the HVAC Systems - Manual sub-section of the appropriate Service Manual.

2. Remove the retaining screws from the covers of the actuators.





3. Install a deflector spring (1), P/N 25732764, on the covers (2) of the actuators. Apply excess lubricant from inside the actuator onto the deflector spring.

4. Install the covers on the actuators.

5. lnstall the cover retaining screws.

Tighten

Tighten the screws to 1.4 N.m (12 lb in).

6. PARK AVENUE:

Install the two air mix (temperature) actuators to the HVAC module assembly. Refer to the Air Mix Actuator - Driver and the Air Mix Actuator - Passenger replacement procedures in the HVAC Systems - Automatic sub-section of the Service Manual.

Warranty Information





For vehicles repaired under warranty, use the table.

BONNEVILLE AND LESABRE:

Install the mode and air mix (temperature) actuators to the HVAC module assembly. Refer to the Mode Actuator and the Temperature Actuator replacement procedures in the HVAC Systems - Manual sub-section of the appropriate Service Manual.





Parts Information

Parts are currently available from GMSPO.





Disclaimer