For 1990-2009 cars

# NEW A/C HIGH SIDE PRESSURE SERVICE PORT ASSEMBLY

#### SUBJECT: INFORMATION - NEW A/C HIGH SIDE PRESSURE SERVICE PORT ASSEMBLY

#### VEHICLES AFFECTED: 1991 A,F,W, CARS

Application: 1991 Chevrolet Camaro and Pontiac Firebird 1991 Chevrolet Lumina 1991 Pontiac Grand Prix and 6000 Models 1991 Buick Regal and Century 1991 Oldsmobile Cutlass Supreme and Ciera

All 1991 'W' and 'Al models and some interim 1991 'F' models will be equipped with a new A/C high pressure service port assembly. The A/C low side pressure service port will remain the same.

The new A/C high pressure port, as shown in Figure 1 is not designed with a depressor pin, compared to the older port, as shown in Figure 2, which has a depressor pin. The new A/C high pressure port will require the use of two special tools for servicing.

Tool J-38702, is a straight adapter which allows existing diagnostic equipment to be connected to the service port, and high side pressures to be checked by opening the port. The adapter connects, first to the gauge hose and then to the high side pressure port, by threading the adapter to the port.

Tool J-38704, is an octagon socket which is used to unthread the A/C high side pressure port from the high side A/C line and then used to thread the new port back onto the high side pressure line.

Tool J-38702 Tool J-38704

Straight Adapter Octagon Socket

Service parts are as follows:

Part Part Number ----------------------------- ----------- Valve Core Housing and O-Ring 52456273 O-Ring 52450548

#### CAUTION:

NEVER REMOVE THE GAUGE LINE FROM ITS ADAPTER WHEN THE LINE IS CONNECTED TO THE A/C SYSTEM. ALWAYS REMOVE THE LINE ADAPTER FROM THE SERVICE PORT TO DISCONNECT A LINE. DO NOT REMOVE THE CHARGING HOSE AT THE GAUGE SET WHILE ATTACHED TO THE SERVICE HIGH SIDE PORT. THIS WILL RESULT IN COMPLETE DISCHARGING OF THE SYSTEM DUE TO THE DEPRESSED VALVE AND MAY CAUSE PERSONAL INJURY DUE TO ESCAPING REFRIGERANT.

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.