Cutlass Ciera Cruiser V6-3300 3.3L (1989)
Coolant Fan Delay Relay: Customer Interest
A/C - Improved Performance on Hot Days City Driving
NUMBER:
89-T-143
CORP.REF.NO: 936526
DATE:
October 1989
SECTION:
6E3
SUBJECT:
IMPROVED A/C PERFORMANCE (PROCEDURE FOR REWIRE OF PUSHER FAN)
MODELS/YEARS:
1989 CUTLASS CIERA WITH 3.3L AND HEAVY DUTY
COOLING OPTION
Some owners of 1989 Cutlass Ciera model's with 3.3L (LG7) engines and heavy duty cooling option (VO8) may comment about the A/C performance on
hot days in city driving conditions. This situation occurs because the VO8 pusher fan may not come on soon enough to keep the A/C system head
pressure below its cutoff value of 400 PSI.
The ECM controls the pusher fan by grounding the pusher fan relay only when the engine coolant temperature reaches 108 degrees C (226 degrees F).
The pusher fan is not controlled by a high pressure switch in the A/C system as stated in the Service Manual.
Normal engine cooling (puller fan) is adequate to keep the engine coolant under 108 degrees C (226 degrees F) but does not supply enough cooling to
the A/C condenser to keep the A/C head pressure below 400 PSI. This results in an A/C system that cycles around its cutoff pressure of 400 PSI.
Procedure:
