Automatic Temperature Control - Erratic Performance

9217buick06

Bulletin 91-1-16

Date Nov. '91

Ref. No. 91-269-1

Corp. Ref. No. 101202R


SUBJECT:
AUTOMATIC DUAL COMFORT TEMPERATURE CLIMATE CONTROL PERFORMANCE

MODELS AFFECTED:
1991 PARK AVENUE/PARK AVENUE ULTRA MODELS


This bulletin supersedes 91-1-6 to reflect the new part.

CONDITION:

Some 1991 Park Avenue/Park Avenue Ultras built prior to VIN M1675000 with option "CJ2" (Automatic Dual Comfort Temperature Climate Control), may exhibit a condition where the customer complains that constant adjustments have to be made to the set temperature and fan settings to maintain comfort. In cold weather, this condition makes the vehicle interior stay hot for a very long time with the blower remaining on high, or in warmer ambient temperatures the vehicle stays cool for a very long time with the blower remaining on high.

CAUSE:

The cause of this condition may be the improper sealing of the In-Car Temperature Sensor to the lower Instrument Panel Trim Plate Seal. This causes the sensor to draw air from under the dash instead of the passenger area through the holes in the Instrument Panel Trim Plate.

CORRECTION:





To correct the above condition, a new seal for the In-Car Sensor to Instrument Panel Trim Plate has been released to improve sealing in this area. Order part number 25608926. See Figure for the installation procedure. This new seal should be installed in any case involving heating or air conditioning performance problems prior to diagnosing suspected control head, programmer or system problems.

PARTS INFORMATION:

Parts are expected to be available on December 2, 1991. In case of limited inventory, parts will be placed on 400 control to waive VIP surcharges. Only verifiable emergency VIP orders will be accepted. SPO will make every effort to obtain parts. However, the part will be shipped premium transportation at dealer's expense and all other order types will be placed on backorder until the 400 control is removed.