A/C - New Dual O-Ring Joint System

89cadillac07

Bulletin No. T-89-105
File in Group 1
Number 64
Corp. Ref. No. 901202
Date May, 1989
SUBJECT: AIR CONDITIONING JOINT DUAL O-RING SYSTEM

MODELS AFFECTED: 1989 DE VILLES AND FLEETWOODS

FIGURE 1:

The 1989 DeVilles and Fleetwoods use a new O-ring joint design for the A/C system which will increase durability and reliability of the joint seal by providing a second O-ring seal.

The dual O-ring fitting design (refer to Figure 1) consists of:

^ Aluminum alloy externally-threaded fitting which is brazed or welded to an aluminum tube.

^ Free spinning, plated steel, internally-threaded nut.

^ Precisioned machine male piloted aluminum tube end which accommodates two O-rings.

FIGURE 2:

FIGURE 3:

FIGURE 4:

FIGURE 5:

FIGURE 6:

Servicing the Dual O-Ring Joint:

When servicing the dual O-ring joint use the following procedure:

CAUTION: Make sure A/C system is completely discharged.

1. Use Kent-Moore tool, J-38042 Dual O-Ring Disassembly Tool, to separate the joint while loosening the female nut. Refer to Figures 2, 3, and 4.

2. Remove and discard O-rings. Use non-metallic tool when removing O-rings to prevent chance of damaging seal surface.

3. Replace O-rings. Avoid excessive stretching and twisting of replacement O-rings.

IMPORTANT: Dual O-ring finings use a different size O-ring from standard A/C joint fittings. Refer to Figure 5.

4. Reassemble O-ring joint. Carefully align forms (tubes) for pilot to bore insertion and push together completely. Refer to Figure 6. Slightly oiling the bore and O-rings with refrigerant oil will aid insertion.

5. Torque steel nut to 15-20 ft.lbs.

NOTICE: The use of proper wrenches when loosening or making corrections is important. A backup wrench should be used on the brazed or welded fitting to prevent distortion of A/C lines.