For 1990-2009 cars

### Removal Procedure

1. Partially drain the cooling system. Refer to Cooling System Draining and Filling.
2. Remove the heater inlet and outlet pipes. Refer to Heater Inlet Pipe Replacement and Heater Outlet Pipe Replacement.
3. Remove the thermostat housing bolts (1).
4. Remove the housing.

### Installation Procedure

Notice: Refer to Fastener Notice in the Preface section.

1. Install the thermostat housing bolts.

Tighten
Tighten the thermostat housing bolts to 10 N·m (89 lb in).

2. Install the heater inlet and outlet pipes. Refer to Heater Inlet Pipe Replacement and Heater Outlet Pipe Replacement.
3. Fill the cooling system. Refer to Cooling System Draining and Filling.