GM Service Manual Online
For 1990-2009 cars only

NEW ACCESSORY DRIVE BELT WITH A/C OPTION C60/C69

VEHICLES AFFECTED: 1989 G3 TRUCKS EQUIPPED WITH 7.4L (VIN CODE N) ENGINE AND AIR CONDITIONING (OPTION C60/C69)

A new accessory drive belt has been released for use on G3 vehicles equipped with a 7.4L (L19) engine and C60/C69 (air conditioning). The new belt, GM P/N 10129580 (which replaced P/N 10101120) is approximately 20 mm shorter in length and will eliminate the possibility of the belt tensioner "bottoming" out after belt break in.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.