WATER LEAK FROM A/C EVAPORATOR DRAIN (INSTALL DRAIN TUBE)

SUBJECT: WATER LEAKS FROM A/C EVAPORATOR DRAIN (INSTALL DRAIN TUBE ON HUMIDITY DRAIN)

MODELS: 1988-92 C/K TRUCKS WITH AIR CONDITIONING

THIS BULLETIN WAS REVISED TO ADD THE 1990-92 MODEL YEARS. IT CANCELS AND REPLACES GMC TRUCK BULLETIN 89-T-86 (CORPORATE BULLETIN #961203). ALL COPIES OF THAT BULLETIN SHOULD BE DISCARDED.

Owners of some 1988-1992 C/K vehicles may comment that water leaks from the A/C evaporator drain into the passenger compartment. This condition can be encountered during A/C operation, especially on days with high humidity. Under normal operation, water gathers on the bottom of the evaporator case and drains out into the engine compartment. However, in some instances, air flowing through the engine compartment can blow the water back toward the opening in the cowl for the evaporator drain. This action may allow the water to seep down into the passenger compartment.

In order to repair this condition, a drain tube (P/N 22542866) should be installed on the end of the evaporator drain (Figure 1). This will allow the water to drain down away from the evaporator drain opening.

SERVICE PARTS INFORMATION:

Part Number Description Qty/vehicle ----------- ----------- ----------- 22542866 Drain Tube 1

Parts are currently available from GMSPO.

WARRANTY INFORMATION:

For vehicles repaired under warranty use:

Labor Operation: T7985 Labor Time: .2 H r.

Note: Labor Operation is coded to base vehicles warranty coverage in the Warranty System.

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.