I have a 1996 chevrolet blazer when i hit the four wheel drive button it locks the drive shaft and i have vacuum at the actuator and my tires dont move
Re: I have a 1996 chevrolet blazer when i hit the four...
There is a cable that runs from the vacuum pot down to the front diff. .. I have seen them corrode under the battery tray and seize up ..You can remove the cable and check for movement.
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There are 2 models here the push button will flash if the system is not engaging or disengaging properly . If front drive shaft is turning. That is with car raised and supported . if front drive axles do not turn then the axle actuator is not engaging axle shaft passenger side. Remove actuator and manually engage shifting collar with a screwdriver still does not turn then inner axle is twisted.
sounds like chevy caught up with dodge!!?? actuator vacuum powered from tranny, check vacuum lines on ends especially . if not its a broken shaft witch i seen my share, or pinion gear but i doubt it should make ungodly sounds if this was so. good luck
Manuel engagement uses a vacuum switch on transfer case that provides vacuum to the actuator next to the battery. Electric types a transfer case motor engages the front drive shaft and a electric axle shift actuator is used to engage the axle shaft on passenger side of differential
The vacuum switch on the transfercase is most likely the problem. If you remove it and the plunger is stuck in, replace it and your 4wd should engage again.
WI replace the wheel bearing and put brakepads on.This is when the problem start...When I am driving I hear a stumping and humming sound. 1996 CHEVELETE BLAZER . YOU CAN PUT IT IN FOUR WHEEL DRIVE
when you engage it in 4 wheel make sure you are getting vacuum to the acuator just pull the hose off and feel to see if there is vacuum if not check all vacuum hoses
The four wheel drive systems in these vehicles are simple. The push button controls the four wheel drive computer. The computer tells the encoder motor (on transfer case) to shift. When the transfer case shifts there is a vaccum switch on the transfer that is activated which sends vaccum to the accuator under the battery. The accuator pulls a cable to lock the front axle in. This covers all s series trucks and suv's with push button four wheel drive but not with auto or all wheel. Now to answer some questions. If your push button is lit up but will not go in to four high you should try to reset the four wheel drive computer. To reset pull the courtesy light and atc fuses for sixty seconds install fuses then cycle key on and off 5 times. If your transfer case shifts but your front end does not lock in check for vaccum at the switch on the transfer case in and out. If no vaccum out replace switch motormite number 49315 at parts store. If you have vaccum out check accuator.
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