Thermostat Housing: Service and Repair

IMPORTANT: During extremely cold weather, -12°C (10°F) 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. Disconnect lower radiator hose at thermostat housing. Use Snap-on Tool HCP10 or 20 (or equivalent).

IMPORTANT: Twist water feed pipe while pulling to remove it from water pump.





3. Remove thermostat and water feed assembly bolts.
4. Remove thermostat housing bolts.
5. Remove thermostat housing and thermostat element.
6. Discard O-ring.

NOTICE: The thermostat will not function correctly once it is contacted by oil. If oil is found in the cooling system, it must be flushed and the thermostat's cartridge replaced.

7. Inspect the thermostat components for damage, seat deterioration, etc.

Installation





1. Install a new O-ring on the inlet housing:
a. Install thermostat and inlet housing into thermostat inlet housing.
b. Install retaining bolts.
^ Torque: 10 Nm (89 ft. lbs.)
c. Close radiator drain plug.

NOTICE: Lubricate the feed tube O-rings with silicon gel lubricant.





2. Install thermostat housing to block bolts.
^ Torque: 10 Nm (89 ft. lbs.)
3. Install the lower radiator hose.

IMPORTANT: The vehicle must be level when filling with coolant.





4. Fill the cooling system to the FULL COLD line with coolant. Use a 50/50 mixture of Dex-Cool antifreeze and clean water.
5. Run engine until upper radiator hose is hot, then add additional coolant, if needed, to bring the level to the FULL COLD line.
6. Install pressure cap and check for leaks.