Thermostat
Warning: Do not start this procedure until the engine is completely cool.
1. Disconnect the cable from the negative battery terminal (see Engine electrical systems).
2. Drain the cooling system (see Tune-up and routine maintenance). Disconnect the radiator hose from the thermostat housing or water inlet pipe.
3. Remove the alternator (see Engine electrical systems), then unbolt the thermostat housing from the engine block (see illustration).
i. 3 With the alternator removed, remove the nuts securing the thermostat housing to the side of the engine block
4. Remove the thermostat, noting the direction in which it was installed in the housing, and thoroughly clean the sealing surfaces.
5. Fit a new rubber gasket onto the thermostat (see illustration). Make sure it is evenly installed all the way around.
i. 5 The thermostat gasket fits around the edge of the thermostat like a grooved sealing ring
6. Install the thermostat into the engine, then install the thermostat housing. Be sure to position the jiggle valve upward at the highest point (see illustration).
i. 6 Position the jiggle valve straight up
7. Tighten the housing fasteners to the torque listed in this Chapter’s Specifications and reinstall the remaining components in the reverse order of removal.
8. Refill the cooling system (see Tune-up and routine maintenance). Run the engine and check for leaks and proper operation.