For 1990-2009 cars

# AIR CONDITIONING JOINT DUAL O-RING SYSTEM

#### SUBJECT: AIR CONDITIONING JOINT DUAL O-RING SYSTEM (NEW PROCEDURE)

#### VEHICLES AFFECTED: 1989 C-H MODELS

The 1989 'C and H' models introduces a new 0-ring joint design for the A/C system which will increase durability of the joint seal by providing a second 0-ring seal.

The dual 0-ring fitting design consists of: (Refer to Figure 1)

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

o Free spinning, plated steel, internally threaded nut.

o Precisioned machine male piloted aluminum tube end which accommodates two 0-rings.

#### Servicing The dual 0-ring joint

When attempting to service the dual 0-ring joint, the following procedures should be followed:

o *Disassemble:

o Make sure A/C system is completely discharged.

o Use Kent-Moore Tool J 38042 (Dual 0-ring disassembly tool), to separate the joint while loosening female nut. Refer to Figures 2, 3 and 4.

o Remove and discard 0-rings.

- Use nonmetallic tool when removing 0-rings to prevent chance of damaging seal surface.

#### Replace 0-rings

o Avoid excessive stretch and twisting of replacement 0-rings.

#### IMPORTANT: Dual 0-ring fittings use a different size 0-ring from standard A/C joint fittings (see Chart 5).

*Reassemble 0-ring joint

- Carefully align forms (tubes) for pilot to bore insertion and push together completely (Refer to Figure 6). - Slightly oiling the bore and 0-rings will aid insertion.

o Tighten steel nut. A torque of 20 - 27 Nm (15-20 ft. lbs.) is required on all dual 0-ring joints.

*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.

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.