A/C - Lack of Sensor Temperature Control
90buick09Bulletin: 90-1-9
Date: May '90
Ref. No.: 90-121-1
Corp. Ref. No.: 001101
SUBJECT: IN-CAR SENSOR COMPONENTS CAUSING LACK OF TEMPERATURE CONTROL REPAIR PROCEDURE
MODELS AFFECTED: 1989 AND 1990 PARK AVENUE/ELECTRA AND LESABRE WITH AUTOMATIC CLIMATE CONTROL (C68)
CONDITION
An inoperative or partially inoperative in-car sensor system has been found to be a possible cause of lack of temperature control and/or temperature overshoot.
The following should be checked if this condition is encountered on the subject vehicles.
CORRECTION
1. Assure the in-car sensor hose is properly connected at both the aspirator and in-car sensor ends. Assure there are no kinks in the hose.
2. Assure the aspirator is firmly seated in the HVAC case and that none of the four attaching legs are broken or the seal is damaged.
3. Assure the in-car sensor and the foam seal are properly seated. There must be no air leakage past the foam seal.
4. The instrument panel trim plate seal must be against the edge of the trim plate and provide a good seal between the trim plate and the instrument panel carrier. This seal assures the sensor gets an accurate air temperature sample from the passenger compartment. If this seal is mispositioned, air will be drawn from behind the instrument panel indicating an incorrect interior temperature to the sensor.
WARRANTY INFORMATION
Use the appropriate Labor Operation for the repair performed.
Trouble Code: 92