Removal Procedure
- Recover the refrigerant. Refer to Refrigerant Recovery and Recharging .
- Remove the front evaporator tube to rear evaporator tube retaining bolt.
- Disconnect the front evaporator tube from the rear evaporator tube, discard the O-ring.
- Using needle nose pliers, CAREFULLY grasp the edge of the expansion (orifice) tube without touching the filter screen and pull to remove the tube.
- Inspect the expansion (orifice) tube for the following conditions and clean or replace with a new tube as indicated:
Important: Cap or tape the open rear evaporator tube immediately to prevent contamination.
Important: Cap or tape the open front evaporator tube immediately.
| • | Broken plastic frame; replace tube |
| • | Filter screen (1,2) torn, damaged or plugged with fine gritty material; replace tube |
| • | Brass orifice tube (3) damaged or plugged; replace tube |
| • | Filter screen (1) coated with metal chips, flakes or slivers; coating may be removed with low pressure shop air and reused if cleaned satisfactorily |
| • | If reusing the tube, install a new O-ring (4) |
Installation Procedure
- Remove the cap or tape from the front evaporator tube.
- Using needle nose pliers, CAREFULLY grasp the edge of the expansion (orifice) tube (long filter screen inlet side of tube) without touching the filter screen and insert the tube (short filter screen outlet side first) fully into the front evaporator tube.
- Remove the cap or tape from the rear evaporator tube.
- Using a lint-free clean, dry cloth, carefully clean the sealing surfaces of the rear evaporator tube and the front evaporator tube.
- Lightly coat the O-ring seal (1) with mineral base 525 viscosity refrigerant oil.
- Carefully slide the new O-ring seal (1) onto the front evaporator tube until seated.
- Install the front evaporator tube to the rear evaporator tube.
- Install the front evaporator tube to rear evaporator tube retaining bolt.
- Evacuate and charge the refrigerant system. Refer to Refrigerant Recovery and Recharging .
- Check the evaporator tube joints for leaks. Refer to Leak Testing .
Important: DO NOT allow any of the mineral base 525 viscosity refrigerant oil on the O-ring to enter the refrigerant system.
Leave a light coating of the refrigerant oil to remain on the front evaporator tube in the area indicated (2) ONLY.
Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
Tighten
Tighten the evaporator retaining bolt to 25 N·m (18 lb ft).
