how would you test the transfer case vaccuum switch on a 94 4.3 s-10 blazer ? i need to know,,on the switch itself,,,which one of the 3 comes from the engine,, and which 1 goes to front actuator,,and which 1 is the vent ? i read that you can put this vaccuum plug on wrong,,i have constant vaccuum at the frant axle actuator,,i was thinking the previous owner may have put it on wrong,,,,i boughtmy blazer from a total drunk,,and i dont have a clue at what all he has done. i have fixxed alot of stuff....i do have a hand operated vaccuum pump,,but i dont want to damage the vaccum switch.. please help !!!!

Combining consecutive posts. Please use the edit function if another member has yet to reply. Thanks! TBB

to simplify things...i need a break down of the transfer case vaccuum switch....which one of the 3 nipples does what??

And another...

which 1 of the 3nipples is the vent? the other 2 should be the vaccuum switch,from the engine to the front actuator...

 

to simplify things...i need a break down of the transfer case vaccuum switch....which one of the 3 nipples does what??

 

which 1 of the 3nipples is the vent? the other 2 should be the vaccuum switch,from the engine to the front actuator...

 

theres 3 vacumhoses comes from TC. One goes directly to switch (should be inder your battery), 2.nd hose goes to vacumsource, directly from manifold or through the canister (ball mounted on the hood) , the 3rd. one is the vent.

if you dont have a vacum leak, you can check your switch if it switches from 2wd to 4wd.
During the years, vacum hoses cracks, I have changed all vacum hoses of mine last month to be safe side.

 

i know where the hoses come from, for the tc vac switch.....i need to know which one on the vaccuum switch itself, does what,,,onthe switch itself which one is the vent ? which one is the source from engine,,and which goes to the front dif actuator....can any one please help??

 

Isee, tuesday i ll be able to lift the car or creep under it, gonna check and let you know if its not that late for you.