For 1990-2009 cars

# A/C REFRIGERANT LOSS DUE TO LOOSE/MISS. ACCESS FITTING CAP

#### SUBJECT: A/C REFRIGERANT LOSS DUE TO DUE OR MISSING ACCESS FITTING CAPS

#### VEHICLES AFFECTED: ALL GM MODELS WITH A/C 1980-91

This bulletin is being revised to add 1990-91 model years and to update a discontinued part number for high side valve-cap and seal.

All GM air conditioning Hi side and Low side access fittings are supplied with a black plastic cap and seal assembly which provides 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 tightened another 1/4 - 1/2 turn to ensure proper sealing.

High Side Low Side

Valve - Cap and Seal Valve - Cap and Seal P/N 52451233 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.