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Turn key to on don't start car.
Turn AC on or turn cruse switch on still don't start car.
Now iv vacuum resivor has low vacuum the pump will run.
If it runs more then a minute or so you have either
1) A vacuum leak
or
2) A bad vacuum sensor in the resivor
or
3)A failed check valve.
To check for 1 pinch the vacuum or pull of and plug one at a time the 3 vaqcuum lines comming out of resivor on the side toward the engine fan.
If pluging/ pinching one lets pump stop after a minute or so you have located prob. If not it is the sensor.
The 3 small lines/hoses are
1) from resivor to manifold this one should have a check valve at resivor nipple (if you attach hose ti resivor nipple you should be able to suck but not blow)
2) Goes to hot water valve at right rear of engine. It is the hose with the wires near it. The wires open and close a valve to this hose.
3)A hose that goes thru fire wall and supplies vacuum to AC controls inside car.
The bigger hose goes to cruse servo near right strut tower.
On the other side of the canister (the side toward the fender) is a small hose which conests to the vacuum pump and the vacuum sensor with wires.
