REMOVAL & INSTALLATION
Fig. Fig. 1 To remove the thermostat, remove the attaching bolts, then the housing
Fig. Fig. 2 Lift off the thermostat housing to expose the thermostat
Fig. Fig. 3 Remove the thermostat, then scrape the gasket material from the housing mating surfaces
Fig. Fig. 4 Exploded view of the thermostat mounting-carbureted Z20 engine
Fig. Fig. 5 Always install the thermostat with the spring facing "down" and the jiggle valve facing "up"
Fig. Fig. 6 Exploded view of the thermostat mounting-L24 engine
Fig. Fig. 7 Exploded view of the thermostat mounting-diesel engine
Drain the engine coolant into a clean container so that the level is below the thermostat housing.
When draining the coolant, keep in mind that cats and dogs are attracted by ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.
Disconnect the upper radiator hose at the water outlet.
Loosen the two securing nuts and remove the water otlet, gasket, and the thermostat from the thermostat housing.
Install the thermostat to the engine, using a new gasket with sealer and with the thermostat spring toward the inside of the engine.
Reconnect the upper radiator hose.
Refill the cooling system. Refer to
for Drain And Refill procedures if necessary. Make sure to let the engine reach normal operating temperature then check coolant for the correct level.