A/C - Compressor Sealing Washer Redesigned

91chevy26

GMC NUMBER: 92-1B-23

GROUP: 1B Air Conditioning


DATE: November, 1991


CORPORATE NUMBER: 131212


SUBJECT: AIR CONDITIONING COMPRESSOR SEALING WASHER USAGE (NEW PARTS)

MODELS: 1988-92 ALL TRUCKS








There has been a redesign of the GM Harrison A/C compressor rear head and the mating face of the attaching hose assembly. The redesign eliminates the two O-ring seals from the compressor, replacing them with two "sealing washers added to the suctional discharge hose set". Each sealing washer consists of a metal washer with an integral molded rubber seal (refer to Illustrations).

THE O-RING AND SEALING WASHER DESIGNS ARE NOT INTERCHANGEABLE. The compressor design will determine which type of washer to use.

^ Use sealing washers on compressors with suction discharge ports having a flat sealing surface.

^ Use O-ring seals on compressors with O-ring grooves in the suction discharge port sealing surface. A service compressor ordered from GMSPO may be of either design. If the compressor uses the sealing washers, the washers will be included with the service compressor.

Use of improper seals may result in damage to the seals and cause leaks.


SERVICE INFORMATION:
Lubrication of sealing washers is neither required nor recommended. Follow the installation instructions included with the parts kits below.

When using sealing washers, there will be an intentional "gap" between the compressor rear head and the air conditioning hose assembly block (suction discharge block assembly). Do not mistake this as a loose connection or a mis-assembled joint.

Sealing washers are used in production on all 1992 vehicles.

PARTS INFORMATION:
Seal or Gasket - A/C Compressor Sealing Washer, Service Kits:

Part
Number Application

2724575 All pre-1992 compressors
2724577 All 1992 compressors with 5/8" suc-
tion port openings
2724578 All 1992 compressors with 3/4" suc-
tion port openings

Parts are currently available from GMSPO.