Thermostat: Service and Repair

1. Disconnect battery negative cable.
2. With engine cool, drain engine coolant below thermostat level. Never open cooling system with engine hot. Failure to follow this warning may cause personal injury.
3. Remove two thermostat housing retaining bolts, then the upper thermostat housing.
4. Remove thermostat and gasket from lower housing, then clean both mating surfaces.
5. Reverse procedure to install. Replace gasket and tighten thermostat housing retaining bolts to specifications.
6. With installation done, ensure draincock is closed, refill radiator with proper coolant mixture, replace pressure cap and start engine. Check for leaks.