For 1990-2009 cars

# A/C REFRIGERANT LOSS DUE TO LOOSE/ MISSING ACCESS FIT. CAP

#### VEHICLES AFFECTED: 1980-1989 ALL G.M. MODELS WITH A/C

All GM air conditioning Hi side and Low side access fittings are supplied with a black plastic cap and seal the primary refrigerant seal for the service fittings.

If the cap and seal assembly is missing or loose, a significant amount of refrigerant may leak through the valve core located in the access fitting, which could result in poor A/C performance or failure.

When servicing any vehicle's A/C system, make sure all access fitting cap seals (refer to Figure 1) are in place and tight. Caps should be threaded on until contact with the "O" ring seal is made and then tight ened another 1/4 - 1/2 turn to ensure proper sealing.

High Side Low Side --------- -------- Valve - Cap and Seal Valve - Cap and Seal P/N 3033974 P/N 6551640

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.