K 2500 Truck 4WD V8-379 6.2L DSL VIN C FI (1989)
Evaporator Drain Tube: Technical Service Bulletins
Interior - Water Leaks From A/C Evaporator Drain
GMC NUMBER:
92-1B-46
GROUP:
1B Air Conditioning
DATE:
January 1992
CORPORATE
NUMBER:
961203R
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:
