Should be located in a removable housing at the engine end of the upper radiator hose Drain about 1 gallon of coolant from the radiator Remove this housing Note how thermostat is installed in housing Clean both surfaces Replace thermostat and gasket Re-install housing Re-fill coolant slowly to prevent an air lock Start engine and look for leaks Run engine to normal operating temperature with heater on Re-check coolant level
follow upper radiator hose to motor
The thermostat on a 1998 Toyota Corolla is located next to the alternator. The alternator may have to be taken off to replace the thermostat.
The thermostat is located by the side of the cylinder block near the coolant inlet. Remove the coolant inlet housing after disconnecting cables and loosening the holding bolts. You will be able to remove the thermostat to replace it.,
First the thermostat must be located on the 1998 Toyota Rav 4. The thermostat housing is on the left side of the engine under the exhaust manifold. The lower radiator hose flows directly to it. Drain the coolant, remove the hose and mounting bolts. Replace the thermostat from the inside of the housing and reinstall.
Toyota recommends every 90K.
4 cylinder has only one thermostat, and 6 cylinder version, I guess, has one too.
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To replace a thermostat on 1998 Silhouette, locate it under the top hose assembly inside the radiator. It is fairly easy to replace with the right tools.