For 1990-2009 cars

### Removal Procedure

1. Gently pull the knobs from the heater control unit.
2. Remove 2 screws in the radio bezel.
3. Remove the 1 screw and the instrument panel cluster right lower cover.
4. Remove the heater control unit from the instrument panel. Refer to Control Assembly Replacement .
5. Disconnect the air conditioning (A/C) switch electrical connector (1).
6. Remove the A/C switch (2) from the heater control unit.

### Installation Procedure

1. Install the A/C switch (2) to the heater control unit.
2. Connect the A/C switch electrical connector (1).
3. Install the heater control unit to the instrument panel. Refer to Control Assembly Replacement .
4. Install the heater control unit knobs.
5. Install 2 screws in the radio bezel.
6. Install the instrument panel cluster right lower cover. Secure the cover with the 1 screw.