Climate Control Unit - High Frequency Noise
CATEGORY: BodySECTION: 8
PAGE: 97
ISSUE: 10/94-0513
CODE: 854
Subject:
Noise From Climate Control Unit
Application:
9000 M92-94
When recirculation is selected, some air leakage may occur at the cable lead-through beside the heating and ventilation box. This is due to excess pressure building up at the fresh air intake when the recirculation damper is closed. This may result in a high frequency noise developing at highway speeds.
This air leakage can be stopped by sealing the cable lead-through with suitable sealant. To ensure that this measure will be fully effective, the cable lead-through should be sealed on both sides (i.e. from the passenger compartment and engine bay).
Cars Affected:
9000 models M92-94 up to VIN Serial No.R1017979
Parts:
Sealant 30 20 716
Action:
First, test drive the car to verify that the noise is occurring as described above.
1. Remove the upper part of the dashboard.
2. Remove the defroster duct and air duct to the side vents.
3. Apply sealant around the cable lead-through seal beside the heating and ventilation box. Also seal the air apertures (A) and below the cable lead-through. See Figure.
4. Open the hood and remove the cover over the bulkhead space.
5. Apply sealant around the cable lead-through seal beside the heating and ventilation box. Also seal the air apertures (A) above and below the cable lead through. See Figure.
6. Road test the car again to make certain the noise complaint has been rectified.
7. Refit the cover over the bulkhead space.
8. Refit the air duct and upper dashboard section.
Warranty Information:
For warranty repairs, please use Failure Coding 82050-96-9-01-05. Time allowance is 0.6 hours which is to be entered as straight time.