Heater-Evaporator Unit Overhaul

1. Pull out the evaporator temperature sensor from the evaporator fins.
2. Remove the self-tapping screws and clamps from the housings.
3. Carefully separate the housings, then remove the evaporator.
4. If necessary, remove the expansion valve.

NOTE: When loosening the nuts of the expansion valve, use a second wrench to hold the expansion valve or evaporator line. Otherwise, they can be damaged.

5. Assemble in the reverse order of disassembly. Make note of following items.
- Replace the O-rings with new ones at each fitting, and apply a thin coat of refrigerant oil before installing them.

NOTE: Be sure to use the right O-rings for HFC-134a (R-134a) to avoid leakage.

- Install the expansion valve capillary tube with the capillary tube in contact with the outlet line directly, and wrap it with tape.
- Reinstall the evaporator temperature sensor to its original location.
- Make sure that there is no air leakage.