Thermostat

GENERAL INFORMATION

The thermostat is housed in the case and secured with bolts to the coolant pump on the front cover side of the engine. Removal

PROCEDURE

1. Disconnect the battery ground cable.

2. Drain the engine coolant (see subsection 2.4.5).

3. Disconnect the hose from the thermostat cover.

4. Disconnect the fan thermoswitch connector on the intake manifold cover (if equipped).

5. Disconnect the wiring from the thermostat cover and move it aside.

6. Remove the bolts and the thermostat cover, carefully tapping or rocking it loose.

7. Remove the thermostat from the housing, noting the position of the air bleed valve.

Inspection

PROCEDURE

1. Suspend the thermostat in a container of water with a thermometer. As the water heats up, the thermostat bypass valve should open. If it does not, replace the thermostat.

2. Check the valve opening temperature of the thermostat.

3. If the thermostat does not close when cooled, it must be replaced.

Installation

PROCEDURE

1. Clean the mating surfaces of the thermostat cover and housing.

2. Install the thermostat so that the air bleed valve (indicated by arrow) faces up.

3. Carefully apply sealant to the mating surface of the housing.

4. Install the thermostat cover and tighten the bolts to the specified torque.

5. Secure the wiring with the clip on the thermostat cover, and connect the fan thermoswitch connector.

6. Connect the hose.

7. Fill with engine coolant.

8. Connect the battery ground.