For 1990-2009 cars

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

1. Disconnect the negative battery cable.
2. Remove the HVAC control assembly. Refer to Heater and Air Conditioning Control Replacement .
3. Remove the screws that secure the switch assembly to the knob mount support.
4. Remove the switch assembly. Note the position of the spring, the electrical contact washer, and the contact key/keyway on the knob post.

### Installation Procedure

1. Install the spring and the electrical contact washer over the blower switch knob post.
2. Align the contact key with the post keyway.
3. Position the switch assembly over the mount posts.
4. Install the switch assembly with the screws.
5. Connect the electrical connectors to the rear of the control assembly.
6. Install the HVAC control assembly. Refer to Heater and Air Conditioning Control Replacement .
7. Connect the negative battery cable.
8. Perform an operational check of the blower switch positions.