Firebird L4-151 25L (1982) - EVAP Thermal Vacuum Valve - Distributor Spark/Canister Purge TVS
Thermal Vacuum Valve - EVAP: Description and Operation
Thermal Vacuum Switch
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When coolant temperature is below the switching point canister purge is controlled by the internal orifice within the switch.
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When coolant temperature is above the switching point the switch opens and canister purge is controlled by manifold vacuum--from the
carburetor port.