G 3500 1 Ton Van V8-379 6.2L DSL VIN J FI (1992)
Evaporator Core: All Technical Service Bulletins
A/C - Water Blows Out Passenger Side Air Duct
Group Ref.: HVAC
Bulletin No.: 361201
Date: December, 1993
SUBJECT:
WATER BLOWS OUT PASSENGER SIDE AIR DUCT, (INSTALL NEW EVAPORATOR BLOWER MOTOR ASSEMBLY)
MODELS:
1990-92 CHEVROLET AND GMC G VANS WITH AIR CONDITIONING
CONDITION:
Some owners may experience a fine mist or possibly water droplets being sprayed out of the A/C duct on the passenger side of the vehicle. This
condition may be encountered during A/C usage, especially on hot days with high humidity.
The evaporator core is a heat exchanger, whereby heat is removed from the air by passing through the evaporator core, resulting in cool air. During this
process of heat loss from the air, any moisture in the air (humidity) condensates on the outside surface of the evaporator core. The moisture should drain
off as water through a drain hole at the bottom of the evaporator case.
In some cases, when the A/C blower setting is on "HI", the air can blow water droplets past the evaporator's foam filter allowing the water to be sprayed
into the A/C ducts.
CAUSE:
The reticulated foam filter is not retaining the condensation (water) which may result in inadequate containment or improper drainage of the water.
CORRECTION:
Replace the Evaporator Blower Motor Assembly. Refer to the parts information section for the proper assembly part number. The new assembly has a
convoluted wire mesh screen that reduces the water splash created by the high blower action.
SERVICE PROCEDURE:
CAUTION:
Avoid breathing A/C refrigerant and lubricant vapors or mist. Exposure may irritate eyes, nose and throat. When working with refrigeration systems,
make sure the area is well ventilated. Always wear goggles and gloves when doing work that involves opening the refrigeration system. If liquid
refrigerant comes in contact with eyes or skin, injury may result.
REMOVAL PROCEDURE
1.
Disconnect negative battery cable. Refer to Section 0A.
2.
Recover refrigerant from the system. Refer to Section 1B, refrigerant recovery, recycling, evacuating, recharging, procedures.
3.
Remove coolant recovery reservoir. Refer to Section 6B1.
4.
Remove right marker lamp. Refer to Section 8B.
