Caprice Wagon V8-307 5.0L (1987)
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Thermal Vacuum Valve - EVAP: Testing and Inspection
EGR Canister Purge Thermal Vacuum Switch (EGR-CP-TVS)
Below the switching point, Ports 1 and 2 should be blocked and no ported vacuum should be directed to the canister and EGR valve.
Above the switching point, Ports 1 and 2 should be open, allowing ported vacuum to be directed to the canister and EGR valve. Replace valve, if
defective.