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How do you replace the thermostat located on a 1988 Mazda 626 4 cylinder automatic?


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2015-07-16 18:28:50
2015-07-16 18:28:50


2.0L Engine

Disconnect the negative battery cable.

Drain the engine coolant from the radiator to below the level of the thermostat.

Fig. 3: To remove the thermostat, first drain the cooling system, then remove the radiator hose-to-thermostat housing cover clamp ...

Fig. 4: ... by sliding back on the hose. Note the alignment marks on the hose and housing cover (arrows)

Fig. 5: Disconnect the hose from the thermostat housing cover

Fig. 6: Loosen the thermostat housing cover attaching bolts ...

Fig. 7: ... then remove them ...

Fig. 8: ... along with the housing cover/water outlet

Fig. 9: Remove the thermostat from the housing by simply pulling it outward

Fig. 10: When installing the new thermostat, note the tab (arrow) which seats into a notch in the housing. Jiggle pin must face straight up

Disconnect the lower radiator hose from the engine.

Remove the housing bolts, thermostat housing, thermostat and gasket.

Do not pry the housing off.

To install:

Clean the thermostat housing and the cylinder head mating surfaces.

Make sure that the thermostat jiggle pin is aligned with the gasket projection.

Install the thermostat to the housing. Align the gasket projection with the opening in the housing. The spring side of the thermostat should face into the housing.

Install the thermostat housing cover and tighten both bolts to 14-19 ft. lbs. (19-25 Nm).

Fill the cooling system. Connect the negative battery cable, start the engine and check for leaks. Check the coolant level and add coolant, as necessary.



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