A/C Compressor O-Ring Seal - Revised

89cadillac15

NO.: 90-I-15
DATE: Oct. 1989

GROUP: 1
CORP. NO.: 931204

Figure 1:

Figure 2:

SUBJECT: A/C COMPRESSOR OVAL O-RING SEAL


Approximately June 1, 1988, the cross-section design of the A/C compressor O-rings was changed from the standard round type to an oval type design. The reason for the design change was to improve the durability of the compressor refrigerant joint. This O-ring can also be used on past model compressors.

It is important to understand that due to the cross-section shape of the oval versus the round design (refer to Figure 1), the oval O-ring does not completely fill the machined O-ring groove in the compressor rear head. Refer to Figure 2. A gap between the oval O-ring inside diameter and the machined groove inside diameter is correct and expected.
In addition, the oval O-ring does not fit freely in the O-ring groove. The O-ring must be coated with approved refrigerant oil and inserted all the way into the O-ring groove prior to the joint assembly.

The service part numbers for the oval O-rings are shown in Figure 1. Parts are currently available from GMSPO.