K 2500 Truck 4WD V8-393 6.5L DSL Turbo (1993)
Drive Belt: Customer Interest
A/C - Inoperative or Accessory Drive Belt Comes Off
Number: 93-149-1B
Section: 1B
Date: MARCH 1993
Corporate Bulletin No.: 371201
ASE No.: A7
Subject:
ACCESSORY DRIVE BELT COMES OFF OR NO AIR CONDITIONING
Model and Year:
1993 C/K TRUCK
CONDITION:
Some owners of early built 1993 C/K trucks with 4.3L (LB4), 5.0L (L03), or 5.7L (L05) engines may comment on their accessory drive belt coming off
when the air conditioner (A/C) is on, or of no air conditioning.
CAUSE:
If the cause of the no air conditioning comment is determined to be a damaged electrical connector on the compressor and there is no obvious reason for
the belt coming off, the cause could be "slugging" of the A/C compressor. "Slugging" is caused by liquid refrigerant passing through the compressor.
CORRECTION:
In November 1992, a change was made in the compressor to reduce the effect of "slugging." Trucks built before the VIN breakpoints listed below or
having a compressor built before November 16, 1992 may need a new compressor. The new compressor part number is 12355387. Be sure the date code
on the new compressor indicates manufacture after November 16, 1992 (see illustration for code location).
Parts are currently available through GMSPO.
IMPORTANT:
Before installing an A/C service compressor, the oil in the compressor should be drained. All service compressors are shipped with 6 oz. of oil. If the oil
is not drained, the cooling capacity of the A/C system will be severely restricted. Refer to the appropriate service manual (Section 1B) for the correct
amount of oil to be added when charging the system.
WARRANTY INFORMATION:
Use applicable labor operation and time.
