Thermostat

DESCRIPTION







The 2.5L engine thermostat is located in a thermostat housing, located below the throttle body. This thermostat has an air bleed valve, located in the thermostat flange.

OPERATION
The engine cooling thermostat is a wax pellet driven, reverse poppet choke type. It is designed to provide the fastest warm up possible by preventing leakage through it and to guarantee a minimum engine operating temperature of 88 to 93°C (192 to 199°F). The thermostat also will automatically reach wide open so it will not restrict flow to the radiator as temperature of the coolant rises in hot weather to around 104°C (220°F). Above this temperature the coolant temperature is controlled by the radiator, fan, and ambient temperature, not the thermostat.
The thermostat is operated by a wax filled container (pellet) which is sealed. When heated coolant reaches a predetermined temperature, the wax expands enough to overcome the closing spring and water pump pressure, which forces the valve to open.
Coolant leakage into the wax pellet will cause a thermostat to fail open. Do not attempt to free-up a stuck open thermostat.