A/C - Low Mileage, Compressor Belt Wear
86chevy14SUBJECT: INCORRECT AIR CONDITIONING COMPRESSOR BELT
MODELS: 1985-86 G VANS EQUIPPED WITH 4.3L (VIN CODE N), 5.0L (VIN CODES H,F), OR 5.7L (VIN CODE L) ENGINE
GMC NUMBER: 86-T-127
SECTION: 6B - Engine Cooling
DATE: December, 1986
Some 1985-86 G vans equipped with the 4.3L, 5.0L, or 5.7L engine and air conditioning (A/C) may experience low mileage A/C compressor belt wear. This condition may be caused by an incorrect belt being installed during production of the vehicle. The incorrect A/C belt (3/8" x 55") has a center cordline (CCL) too low in the belt cross section which can cause overloading of the belt.
A new A/C belt (3/8" x 54.5" "High Ride") which has a higher CCL has been released for service use. If this condition is encountered, replace the A/C compressor belt with P/N 469594. Tighten belt to 645 N (145 lb) using belt tension gauge J-23600-B or BT 33-95-ACBN. Refer to the belt replacement procedures in the Light Duty Service Manual, Section 6B, Engine Cooling.