Thermostat Housing: Service and Repair

IMPORTANT: During extremely cold weather, 10°F (-12°C) or colder, your engine's coolant temperature will decrease quickly when idling with the heater fan on high speed and cool air may flow from the heater outlets. The fan control switch can be set at a slower speed position (fan speed I or II) to maintain the hottest air flow.

REMOVAL





1. Drain coolant. (Refer to "Engine Coolant Check and Replacement".)
2. Remove intake plenum. (Refer to "Intake Plenum" removal.)
3. Remove intake manifold. (Refer to "Intake Manifold" removal.)





4. Remove radiator hose from inlet housing.
5. Remove thermostat extension housing bolt.
6. Remove and discard O-ring seals.





7. Remove thermostat with housing:
^ Remove bolts.
^ Tilt the rear of the thermostat housing upward.
^ Lift out the housing.
^ Remove seal ring.
^ Discard seal ring.

Installation





1. Install the thermostat with housing:
^ Install a new seal ring.
^ Position the thermostat with the housing.
^ Install the housing bolts.
^ Torque: 20 Nm (15 ft. lbs.)





2. Lubricate the extension housing O-rings with coolant.
3. Install O-rings on extension housing.





4. Install extension housing on thermostat housing.
5. Install extension housing bolt.
^ Torque: 20 Nm (15 ft. lbs.)





6. Install the radiator hose to thermostat extension pipe.
7. Install intake manifold. (Refer to "Intake Manifold" Installation.)
8. Install intake plenum. (Refer to "Intake Plenum" installation.)
9. Fill the cooling system. (Refer to "Coolant Fill".)