HEY YALL I HAVE A 97 S10 BLAZER 4X4 AND I HAVE BEEN WORKING ON THE 4WD.THIS IS WHERE IM AT.I COULDNT GET THE FRON WHEELS TO LOCK IN,BUTMY DRIVE SHAFT TO THE TRANSFER CASE WAS SPINNING.SO I TOOK THE BATTERY OUT AND LOOKED AT THE ACUATOR AND IT LOOKED GOOD,BUT IT WASNT PULLING THE CABLE.SO I TRACED THE VACUUM LINE DOWN AND IT GOES TO THE TRANSFER CASE,ALONG WITH 2 OTHERS.WELL I PULLED THAT LITTLE PLASTIC THING THAT THE LINES GO IN OFF OF THE TRANSFER CASE,LOOKED AT IT AND STUCK IT BACK ON THERE.THEN I WENT UNDER THE HOOD AND FOUND THE MAIN LINE GOING TO THE TRANSFER CASE FROM THE VACUUM BALL BROKE,SO I TIED IT BACK IN TO ANOTHER BROKE LINE,SO NOW I HAVE VACUUM TO THE ACUATOR.WELL WHEN I LOCK IT IN IT GOES RIGHT TO 4LO,BUT WHEN I GO TO GET OUT AND GO BACK IN THE 2HI IT WONT STOP SUCKING AIR.THATS WHAT IM TRYING TO FIND OUT.IS THERE A WRONG WAY YOU CAN PUT THOSE LINE BACK ON THE TRANSFERCASE??THE LITTLE PLASTIC PIECE THAT THEY GO TO IS LIKE A TRIANGLE.


THANKS ALOT,
BRANDON
97 BLZ4X4

 

It's been a long time since I've looked at that vacuum system, but yes, I do believe that you can install the triangle shaped plug on to the switch incorrectly.
IIRC there is a little tab on the rubber plug where it attatches to the switch. I believe that its awkward to get up there, but I'd try pulling it off, and try to line it up differently. That's the connection at the transfer case switch.
Let us know what you find.

 

Is your transfer case switch( where that 3 plug vacuum set goes into) bad? I replaced mine and it blew the actuator out, now Im getting rid of the vacuum system. its not worth the headache when there is an easier way of having 4x4.

 

thanks alot yall,i havent had a chance to get out there and look at it,but when i do i will let yall know.sorry yall but one more thing.when you kick your 4wd from 4 lo to 2 hi does the vent line take the vacuum from the line running to the actuator and where is vent line run to???? thanks alot yall

97blz4x4
brandon

*Combining consecutive posts*
ok yall i put the thing the tree lines go to on there right in the groove and it is still pulling vacuum on the line that goes to the actuator while it is 2wd.so what the vacuum switch is bad or what????thank guys

*Combining consecutive posts*
oh yea how do you install that vacuum switch,how does it come off??????

*EDIT by swartlkk* - Combining consecutive posts. Please edit your most recent post to include any new information that you would like to add if no one else has replied.

 

It comes off( vac switch) but its a PITA, just have patience and it will work out. The blazer has taught me patience very well.

 

The vacuum switch screws in...use a 7/8" wrench...it is very common for these to stick like this and the front axle stays engauged. I just changed mine at the last oil change for the hell of it because I had 5 or 6 brand new ones laying in my tool box...If you need one I'll sell it shipped for $22.00.

 

hey guys thank yall alot.i put a new switch in it and it worked out great.does the transfer case hold dex3??and the differ. holds 90w??i think the transfer case needs to be changed,if you can change it,i have never messed with a 4wd enough to know.well thanks again yall,your help well needed.
97blz4x4
brandon

 

hey man does the cv axle's suppost to turn when your in 2lo????

 

Yes, they are splined to the wheel hub...they turn whenever the wheels are turning.