Fleetwood FWD V8-273 4.5L (1988)
Cabin Temperature Sensor / Switch: All Technical Service Bulletins
Climate Control - Temperature Drifting
Bulletin No.
T-91-37
File in Group
1
Number
71
Corp. Ref. No.
711202R
Date
Feb. 1991
SUBJECT:
CLIMATE CONTROL TEMPERATURE DRIFT
MODELS AFFECTED:
1985-1991 DE VILLES AND FLEETWOODS
This bulletin supersedes bulletin T-87-103 which should be discarded. The 1988-1991 model year vehicles have been added to this bulletin and the
procedure has been revised.
Some 1985-1991 DeVilles and Fleetwoods may exhibit A/C-heater temperature drift. This condition may be caused by insufficient air flow over the
in-car temperature sensor which may be caused by one or more of the following items:
^
Disconnected or kinked aspirator hose.
^
In-car temperature sensor opening in the upper I/P cover restricted by excess vinyl material.
^
"Cadillac" script restricting air flow over the in-car temperature sensor.
^
In-car sensor misaligned or touching sensor housing.
To repair this condition use the following procedure:
1.
Remove the upper I/P cover as outlined in Section 8C of the Cadillac Service Information Manual. During the removal operation inspect the
aspirator hose for disconnects and/or kink which may restrict aspirator operation. If a disconnected or kinked hose is found, repair and retest as
above.
Figure 1A - Proper Sensor Location
Figure 1B - Severe Mislocation of Sensor
