Tick-Tock Noise from HVAC Module Assembly (Install Spring)

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

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.

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. Install 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.

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 are currently available from GMSPO.

For vehicles repaired under warranty, use: