Park Avenue Ultra V6-3.8L SC VIN 1 (1991)
Air Duct: All Technical Service Bulletins
A/C - Unbalanced Defroster Performance
Group Ref.: HVAC
Bulletin No.: 331223A
Date: December, 1993
SUBJECT:
UNBALANCED DEFROSTER PERFORMANCE
(REPLACE DEFROSTER MODULAR DUCT ASSEMBLY)
MODELS:
1991-93 BUICK PARK AVENUE
1991-93 CADILLAC DEVILLE
1991-93 OLDSMOBILE NINETY EIGHT
1992-93 BUICK LESABRE
1992-93 OLDSMOBILE EIGHTY EIGHT
1992-93 PONTIAC BONNEVILLE
THIS BULLETIN IS BEING REVISED TO SPECIFY REFERENCES TO FIGURES 3 AND 4. THESE FIGURES WERE INCLUDED IN THE
ARTWORK, BUT WERE NOT REFERENCED IN THE BULLETIN TEXT.
CONDITION:
Some vehicles may exhibit unbalanced air flow from the windshield defroster outlets. This usually results in the passenger side of the windshield
defrosting faster than the driver's side.
CAUSE:
Unbalanced flow of heated air through defroster outlets.
CORRECTION:
Replace defroster modular duct assembly with a revised design that provides balanced outlet air flow.
Cadillac, Pontiac, Oldsmobile -
CAUTION:
If vehicle is equipped with Supplemental Inflatable Restraint (SIR), refer to CAUTIONS in Section 9J under ON VEHICLE SERVICE and the SIR
component and wiring location view in Section 9J before performing service on or around SIR components or wiring. Failure to follow CAUTIONS
could result in possible air bag deployment, personal injury, or otherwise unneeded SIR system repairs.
Buick -
CAUTION:
If vehicle is equipped with Supplemental Inflatable Restraint (SIR), refer to the Supplemental Inflatable Restraint (SIR) section of the ESM for
CAUTIONS under ON VEHICLE SERVICE. Also refer to SIR component and wiring location views before performing service on or around SIR
components or wiring. Failure to follow CAUTIONS could result in possible air bag deployment, personal injury, or otherwise unneeded SIR system
repairs.
REMOVE:
1.
I/P carrier. Refer to Service Manual, Section 8C (Cadillac, Oldsmobile and Pontiac); ESM General Air Conditioning Section (Buick).
Notice:
Be sure to loosen lower steering column mounting bracket before lowering steering column or bracket damage will result.
2.
Vacuum harness retainers and vacuum lines from actuators. Note positions.