Thermostat: Service and Repair
REMOVAL OF THERMOSTAT1. DRAIN ENGINE COOLANT
2. REMOVE WATER INLET PIPE
- Disconnect lower radiator hose from water inlet pipe.
- Remove timing belt from water pump pulley.
- Remove the bolt holding the water inlet pipe to the alternator belt adjusting bar.
- Remove the water inlet pipe and o-ring.
3. DISCONNECT WATER TEMPERATURE SENSOR CONNECTOR
The Water Temperature Switch (for Cooling Fans) Is Located On The Water Inlet:
4. REMOVE WATER INLET
- Remove the three nuts and water inlet from the water pump.
5. REMOVE THERMOSTAT AND GASKET
INSPECTION OF THERMOSTAT
INSPECT THERMOSTAT
HINT: The thermostat is numbered with the valve opening temperature.
(a) Immerse the thermostat in water and gradually heat the water.
(b) Check the valve opening temperature
Valve opening temperature: 80 - 84°C (176 - 183°F)
- If the valve opening temperature is not as specified, replace the thermostat.
(c) Check the valve lift.
Valve lift: 8.5 mm (0.335 in.) or more at 95°C (203°F)
- If the valve lift is less than specification, replace the thermostat.
(d) Check that the valve spring is tight when the thermostat is fully closed.
INSTALLATION OF THERMOSTAT
1. PLACE THERMOSTAT IN WATER PUMP
(a) Install a new gasket to the thermostat.
(b) Align the jiggle valve of the thermostat with stud bolt (A), and insert the thermostat in the water pump.
The Water Temperature Switch (for Cooling Fans) Is Located On The Water Inlet:
2. INSTALL WATER INLET
- Install the water inlet with the three nuts.
Torque: 200 kg-cm (14 ft-lb, 20 N-m)
3. CONNECT WATER TEMPERATURE SENSOR CONNECTOR
4. INSTALL WATER INLET PIPE
Note: Apply soapy water on the o-ring before installing the pipe to the water inlet.
5. FILL WITH ENGINE COOLANT
6. START ENGINE AND CHECK FOR LEAKS