A4 V6-3.0L (AVK) (2004)
Compressor Pulley: Customer Interest
A/C - Rattling Noise From The A/C Compressor
87 08 12
2017084/2
December 5, 2008.
Supersedes Technical Service Bulletin Group 87 number 08-01 dated January 10, 2008 for reasons listed below.
Affected Vehicles
87 Rattle noise from engine area
Condition
Rattle noise from the air conditioning compressor. The noise is particularly audible in ECON operation. When the compressor operates under load, the
noise is hardly audible. This condition is exhibited only in vehicles equipped with a DENSO air conditioning compressor with a plastic pulley.
Technical Background
Damper elements of the plastic pulley are noisy under little or no compressor load.
Production Solution
New compressor from model year 2008.
Service
1. Check whether a plastic pulley is installed on the air conditioning compressor.
2. Make certain that the vehicle is in a temperature environment above 5 degrees C (approximately 40 degrees F), as a compressor shut off
condition is active below this temperature.
3. Set the HVAC system to full cooling, and listen for noise.
4. Activate ECON mode. If the noise is only present in ECON and not in full cooling, it is likely that the compressor pulley is the source of the noise.
Figure 1