Firebird V8-305 5.0L (1982)
Distributor Thermal Vacuum Switch: Testing and Inspection
Distributor Thermal Control Valve
Distributor Thermal Control Valve
COLD--Engine Coolant Temperature Below 61° F
Vacuum should pass through the valve.
WARM--Engine Coolant Temperature Above 76° F
Passage of vacuum should be completely restricted.
NOTE: Refer to the number stamped on the base of the switch or valve for calibrated switching or activation temperatures.