Thermostat: Service and Repair

WATER INLET AND THERMOSTAT ASSEMBLY

CO-28 Component:

Removal and Installation

REMOVAL
1. Remove engine room cover (RH and LH).
2. Remove air duct (inlet).
3. Remove front engine undercover using power tool.
4. Drain engine coolant from radiator drain plug at the bottom of radiator, and from water drain plug at the front of cylinder block.

CAUTION:
^ Perform this step when the engine is cold.
^ Never spill engine coolant on drive belts.

5. Disconnect radiator hose (lower) and oil cooler water hose from water inlet and thermostat assembly.





6. Remove water inlet and thermostat assembly.

CAUTION: Never disassemble water inlet and thermostat assembly. Replace them as a unit, if necessary.

INSPECTION AFTER REMOVAL
1. Check valve seating condition at ordinary room temperatures. It should seat tightly.








2. Check valve operation.
^ If the malfunctioning condition, when valve seating at ordinary room temperature, or measured values are out of the standard, replace water inlet and thermostat assembly.

INSTALLATION
Note the following, and install in the reverse order of removal.

CAUTION: Be careful not to spill engine coolant over engine room. Use rag to absorb engine coolant.

INSPECTION AFTER INSTALLATION
^ Check for leaks of engine coolant using the radiator cap tester adapter (commercial service tool) and the radiator cap tester (commercial service tool). Refer to, "Inspection". System Inspection
^ Start and warm up the engine. Visually check that there is no leaks of engine coolant.