For 1990-2009 cars

### Removal Procedure

1. Remove the heater A/C module. Refer to HVAC Module Assembly Replacement .
2. Remove the temperature valve electric actuator. Refer to Temperature Actuator Replacement in HVAC System -- Manual.
3. Remove the air inlet housing retaining screws.
4. Remove the air inlet housing.
5. Remove the heater A/C module upper mounting screws.
6. Release the retaining tab (1) and separate the upper and lower module halves.
7. Remove the HVAC module seal that is located between the upper and lower cases.

Start to remove the module case primary seal (blower motor side of case) seal (2) from the lower module case at the position shown (1).

8. Remove the temperature valve.

### Installation Procedure

1. Install the temperature valve.
2. Install the new case seal to the HVAC module case.

Start to install the lower case seal (2) to the lower case from the position shown (1).

3. Wet the upper evaporator core seal with water.

This will ease the assembly of the upper heater A/C module to the lower heater A/C module.

Important: Inspect the condition of the retaining tab on the upper module case prior to installing the lower module case. If the retaining tab is broken or damaged, install an external retaining clip (P/N 52458793, or equivalent).

4. Align and install the upper module case to the lower module case.

Align and secure the retaining tab (1) on the upper module case to the retaining slot on the lower module case.

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.

5. Install the heater A/C module upper mounting screws.

Tighten
Tighten the heater A/C module upper mounting screws to 1.6 N·m (14 lb in).

6. Install the air inlet housing.

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.

7. Install the air inlet housing retaining screws.

Tighten
Tighten the screws to 1.6 N·m (14 lb in).

8. Install the temperature valve electric actuator. Refer to Temperature Actuator Replacement in HVAC System -- Manual.
9. Install the heater A/C module. Refer to HVAC Module Assembly Replacement .