For 1990-2009 cars

### Removal Procedure

1. Remove the HVAC module. Refer to HVAC Module Assembly Replacement .
2. Remove the defroster actuator. Refer to Defroster Valve Actuator Replacement .
3. Remove the defroster valve spring.
4. Remove the heater/defroster slave valve linkage.
5. Remove the screw for the mode/defroster valve case cover retainer.
6. Remove the retainer.
7. Remove the mode/defroster valve case cover screws.
8. Remove the mode/defroster valve case cover.
9. Remove the defroster valve (1) from the module case.
10. Inspect the defroster valve for damage.

### Installation Procedure

1. Install the defroster valve (1) to the module case.
2. Install the mode/defroster valve case cover.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

3. Install the mode/defroster valve case cover screws.

Tighten
Tighten the cover screws to 1 N·m (9 lb in).

4. Install the mode/defroster valve case cover retainer.
5. Install the screw for the retainer.

Tighten
Tighten the retainer screws to 1 N·m (9 lb in).

6. Install the defroster valve spring.
7. Install the heater/defroster slave valve linkage.
8. Install the defroster actuator. Refer to Defroster Valve Actuator Replacement .
9. Install the HVAC module. Refer to HVAC Module Assembly Replacement .