INOPERTIVE AIR CONDITIONING WARM AIR BLOWS FROM REAR

VEHICLES AFFECTED: 1984-85 C, K, G Models With Rear Air Conditioning

The thermal expansion valve (Refer to Figure No. 1) used in rear air conditioning units, contains a small 'funnel shaped' screen. If this screen becomes plugged, the rear air conditioning unit will not function properly.

Harrison Radiator corrected this situation on January 18, 1985, by installing the screen in the opposite direction from the original position. When viewed through the opei-iing in the expansion valve fitting, the screen should be positioned as it appears in Figure No. 2. This allows any debris in the system to collect around the base of the screen, while permitting the rear air to function properly.

Vehicles which are found to have plugged filter screens should have the screen cleaned and the direction reversed so it is the same as the valve shown in Figure 2.

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.