Hi Lisa, follow the large top coolant hose from the radiator to the engine. You should see 2 or 3 bolts holding the housing to the engine.
The thermostat sits inside of the housing.
SOURCE: thermostat location
The thermostat is located directly under the distributor cap, on the end of the cylinder head. Easy to remove/replace. Drain the coolant, remove the 2 nuts that holds the housing on, and remove it. The thermostat stays in the cyl head, just pull it out. Note that the "Wiggle-Valve" must be placed at the 12 oclock/straight up position. Hope this helps, in lieu of a picture.
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SOURCE: How difficult to replace Toyota Corolla '95
Its under where the top hose goes into engine, It is pretty easymake sure to get some forma gasket when putting back together
SOURCE: Pressure Control Solenoid "D" location on a 2005 Toyota Corolla?
this solenoid is part of the solenoid pack that is located on the valve body inside the transmission.
SOURCE: '03 Toyota Corolla 1,4 VVT-i 4ZZ engine idle rpm
Check your idle speed control valve situated at the bottom of the throttle body. Sometimes the valve sticks and will make the engine rev high or low at idle and the ECU can't adjust it properly.
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16331a code is for thermostat
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