Rear Heater-A/C Unit Removal and Installation

Rear Heater-A/C Unit Removal and Installation

1. When the engine is cool, drain the engine coolant from the radiator.
2. Recover the refrigerant with a recovery/recycling/charging station.
3. Remove the center console.
4. Remove the shift cable from the shift lever.




5. Disconnect the connectors (A) from the shift lock solenoid, the mode switch, the front stereo amplifier and the rear blower motor relay, then remove the wire harness clips (B). Remove the bolts and the shift lever bracket (C).




6. Slide the hose clamps (A) back, then disconnect the inlet heater hose (B) and the outlet heater hose (C) from the rear heater core. Engine coolant will run out when the hoses are disconnected; drain it into a clean drip pan. Be sure not to let coolant spill on the electrical parts or the painted surfaces. If any coolant spills, rinse it off immediately.




7. Remove the nuts at the rear evaporator suction line (A) and the receiver line (B) connections.




8. Disconnect the connectors (A) from the rear blower motor, the rear power transistor, the rear air mix control motor and the rear mode control motor, then remove the wire harness clips (B). Remove the mounting bolts and the rear heater-A/C unit (C). Plug or cap the lines immediately after disconnecting them to avoid moisture and dust contamination.
9. Install the unit in the reverse order of removal, and note these items:
- If you're installing a new rear evaporator, add refrigerant oil (DENSO ND-OIL 8).
- Replace the O-rings with new ones at each fitting, and apply a thin coat of refrigerant oil before installing them. Be sure to use the right O-rings for HFC-134a (R-134a) to avoid leakage.
- Immediately after using the oil, replace the cap on the container, and seal it to avoid moisture absorption.
- Do not spill the refrigerant oil the vehicle; it may damage the paint; if the refrigerant oil contacts the paint, wash it off immediately.
- Do not interchange the inlet and outlet heater hoses, and install the hose clamps securely.
- Refill the cooling system with engine coolant.
- Make sure that there is no coolant leakage.
- Evacuate the system.
- Charge the system and test its performance.