A/C Defrost Valve - Creak Noise When Changing Modes
File In Section: 1 - HVACBulletin No.: 63-11-08
Date: May, 1996
Subject:
A/C Defrost Valve "Creak" Noise when Changing Modes (Lubricate A/C Defrost Valve Shaft with Silicone Grease)
Models:
1996 Buick Park Avenue
1996-97 Buick LeSabre
1996 Cadillac Concours, DeVille, Eldorado, Seville
1996 Oldsmobile Eighty Eight, Ninety Eight
1996 Pontiac Bonneville
Built Prior to February 2, 1996
Condition
Some owners may comment on a "creak" noise from the A/C defrost valve when changing HVAC modes.
Correction
1. Remove left side sound insulator.
2. Lubricate A/C defrost valve shaft with silicone grease.
3. Operate A/C mode valve to verify "creak" noise is suppressed or eliminated.
4. Reinstall left side sound insulator.
Warranty Information
For vehicles repaired under warranty, use:
Labor
Operation Description Labor Time
Actuator Vacuum 0.3 hr
D1787 Diaphragm - Replace