A/C - O-Ring Push Out During Installation
89Oldsmobile10SUBJECT: SERVICE PROCEDURE O-RING PUSH OUT DURING HI SIDE SWITCH INSTALLATION
MODELS/YEARS: 1988-1990 CUTLASS CALAIS AND 1988 FIRENZA
MODELS WITH C60
NUMBER: 90-T-04
CORP. REF. NO: 971206
DATE: August 1989
SECTION: 1B
Figure 1:
Due to a stack up of tolerances between the high side pressure switch or sensor and the high side port, some difficulty may be encountered when replacing a switch or sensor with the refrigerant system changed. The Schraeder (R) valve may be depressed before the O-ring is captured by the switch resulting in the Oring being pushed out of its sealing area causing a leak.
On vehicles with this condition, the O-ring may be held in place by wrapping a string around the inboard side of the switch port while the switch is being screwed on (refer to Figure 1). This will hold the O-ring in the switch port while the Schraeder (R) valve is being depressed. Once the O-ring is captured, the string should be removed and the switch screwed on until fully seated. The joint should then be leak checked with a refrigerant detector.
Redesigned parts will be in production during the 1990 model year.