Rendezvous AWD V6-3.6L VIN 7 (2004)
Compressor/Pump: All Technical Service Bulletins
Air Suspension - Loud Buzzing Noise
Bulletin No.: 04-03-15-001
Date: May 27, 2004
TECHNICAL
Subject:
Loud Buzz Type Noise Heard Inside Vehicle (Inspect Automatic Level Control Air Compressor Bracket)
Models:
2003-2004 Buick Rendezvous
2003-2004 Pontiac Aztek
with Automatic Air Level Control System (RPO G67)
Condition
Some customers may comment on a loud buzz type noise that can be heard inside the vehicle. This noise may be duplicated by turning on the air
compressor at the auxiliary air outlet located in the rear cargo area of the vehicle.
Cause
The cause of this noise may be from the automatic level control air compressor grounding out on its mounting bracket. This occurs when ice builds up or
small rocks become wedged between the compressor head and the forward end of the compressor bracket. Also, the forward lower part of the bracket
may become bent up and rearward and touch the compressor.
The noise is loudest inside the vehicle due to the vibration transmitted from the compressor directly to the vehicle body when the rubber isolators are
bypassed by the grounding condition.
Correction
1.
Confirm that the noise can be heard inside the vehicle with the compressor running. Close all doors and windows and start the vehicle. Normally
about 30 seconds later, the compressor will cycle for about 5 seconds. If not, turn the compressor on at the rear auxiliary air outlet.
2.
Inspect the area (1) between the compressor head and the forward end of the compressor bracket for ice build up or rocks. Remove any material or
debris.
3.
Inspect the lower part (2) of the assembly bracket and make sure it is not touching the compressor. If it is, bend it back to its original position.
4.
If the vehicle was built before April 2003, it will not have a rubber shield on the forward area of the assembly bracket. In this case, install shield
