Expo AWD L4-2350cc 2.4L SOHC 8 Valve (1992)
Thermal Vacuum Valve: Description and Operation
Thermo Valve Location
PURPOSE
To provide control over EGR operation based on coolant temperature.
LOCATION
Located on the thermostat housing,
CONSTRUCTION
The valve, is a thermo-wax type.
OPERATION
As the engine temperature rises above a preset point, a wax element in the unit expands moving a mechanical valve in the unit. This closes off the vented
port (closing the valve) providing vacuum to the EGR valve.
