For 1990-2009 cars

### Removal Procedure

Caution: Refer to Battery Disconnect Caution in the Preface section.

1. Disconnect the negative battery cable.
2. Remove the instrument panel assembly. Refer to Instrument Panel Assembly Replacement .
3. Drain the cooling system. Refer to Cooling System Draining and Filling .
4. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging .
5. Compress the heater hose clamps at the cowl and slide the clamps toward the engine.
6. Remove the 2 heater hoses from the core lines at the cowl.
7. Turn the condensation drain hose and pull the hose off.
8. Remove the nuts that secure the A/C suction hose and liquid evaporator pipe connector block at the cowl.
9. From the engine side of the cowl, remove the screws that secure the heater/air distribution case assembly to the cowl.
10. Remove the heater/air distribution case assembly from the vehicle.

### Installation Procedure

1. Clean the O-ring surface areas of dirt and contamination.
2. Install 2 new O-rings onto the A/C suction hose and the liquid evaporator pipe at the cowl in the engine compartment.

Notice: Refer to Fastener Notice in the Preface section.

3. Install the heater/air distribution case assembly and tighten the screws.

Tighten
Tighten the heater/air distribution case assembly retaining screws on the cowl side to 8 N·m (71 lb in).

4. Install the A/C suction hose and liquid evaporator pipes onto the evaporator flange connector block and tighten the nut.

Tighten
Tighten the liquid evaporator pipe connector block nut to 15 N·m (11 lb ft).

5. Connect the 2 heater hoses to the heater core tubes.
6. Slide the heater hose clamps into position.
7. Install the case condensation drain hose.
8. Install the instrument panel assembly. Refer to Instrument Panel Assembly Replacement .
9. Fill the cooling system.
10. Connect the negative battery cable.
11. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
12. Operate the HVAC control to verify the proper function of the heating and cooling systems.