For 1990-2009 cars

### Removal Procedure

1. Drain the cooling system. Refer to Cooling System Draining and Filling .
2. Open the air inlet grille for the passenger compartment air filter.
3. Remove the access panel nut near the passenger compartment air filter.
4. Remove the access panel.
5. If necessary, disconnect the heater core connection to provide extra clearances (discard assembly marker (1) if in place).
6. Remove the following components from the hot water flow control valve:

• | The vacuum hose

• | The remaining hose clamps

• | The remaining hoses

7. Remove the hot water flow control valve.

### Installation Procedure

1. Install the hot water flow control valve.
2. Install the following hot water flow control valve components:

• | The hoses

• | The hose clamps

• | The vacuum hose

3. Connect the heater core connection if disconnected (green assembly marker (1) is not needed).
4. Install the access panel.
5. Install the access panel nut until fully seated and not stripped.
6. Close the air inlet grille for the passenger compartment air filter.
7. Fill the cooling system. Refer to Cooling System Draining and Filling .