A/C - Electronic Climate Control Too Warm In Heat Mode
Bulletin No.: T-92-130File in Group: 1
Number: 88
Corp. Ref. No.: 1211105
Date: Sept. 1992
SUBJECT:
ELECTRONIC CLIMATE CONTROL (ECC) TOO WARM IN HEAT MODE
MODELS AFFECTED:
1992 DE VILLES AND FLEETWOODS (VIN BREAKPOINT N4257163)
Some 1992 DeVilles and Fleetwoods may control too warm when operating in heat mode. This may be due to an incorrect calibration within the BCM PROM.
IMPORTANT:
Vehicles prior to VIN breakpoint N4257163 with this concern should perform Service Bulletin T-92-30A (for cool air from defrost and side window defog outlets and imbalanced duct temperature from right to left in heat). Replacing PROM with newly calibrated PROM without changing the air distribution baffles within the HVAC module could enhance a temperature variation concern.
To correct this concern replace the BCM PROM with the part listed below:
PROM Broadcast
I.D. Code P/N
68 BCRS 16183880
For more information on PROM replacement procedure refer to the Service Information Manual, Section 8C.
Parts are currently available from GMSPO.
For warranty purposes use Labor Operation N4801 at .6 hour.