For 1990-2009 cars

# REPETITIVE INOP A/C COMPRESSOR FLUSHING PROCEDURE REVISED

#### VEHICLES AFFECTED: ALL WITH AIR CONDITIONING

The use of air conditioning flushing to prevent a repetitive inoperative condition of the compressor after an internal compressor malfunction has received recent attention.

After a compressor has become inoperative internally, the expansion (orifice) tube assembly should be removed and checked for contamination of the filter screens. If contamination is noted, flush the system with refrigerant 12 (R-12), following the procedure outlined in the 1987 Chassis Service Manual.

On the cars where the expansion tube assembly is remote from the evaporator inlet, the same flushing procedure should be followed and the expansion tube assembly checked for contamination. Repeat the flushing procedure, if required, until the screens on the expansion tube assembly do not indicate new contamination. An in-line filter is being developed for use with remote expansion tube assembly locations.

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.