Question about 2001 Chevrolet Blazer

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2001 Chevy Blazer 4 wheel drive

So my four wheel drive went out, i had a mechanic replace the push button on the dash, was told that wasnt it and it was the actuating motor. So I replaced it, it does the same thing it did before. It starts in four wheel drive, and if i hit the auto four wheel drive button then the two wheel drive button it tries to but then turns off completely till the car is restarted.. I have no idea what is wrong with it, i'm going to take it to a shop to have the four wheel drive read by one of those computers and see what it says, any ideas though????

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  • Anonymous Jun 07, 2008

    my truck does almost the same thing except it goes into 4low by its self all the time and is hard to get back into 2high so i removed the fuse to stop the 4wheel drive from working all together it has to be something in the electrical.

  • upkerry Aug 07, 2008

    my 2001 blaser 4 wheel drive was working fine but now when i push the button for four wheel i don't see the light and dose not go in 4 wheel check the fuse and that was ok

  • joeldunstan Nov 10, 2008

    I have a 2000 Blazer and have had the actuator motor replaced as well. My problem is that it says on the dash the 4 wheel drive has engaged , but in actual fact it hasn't. It sounds like it has but no go.

  • cvrstairs Dec 01, 2008

    my 2001 blazer will not lcok into 4 hi or auto 4. the lights just blink. you can hear it try to shift over but it will not fully engage

  • Anonymous Dec 17, 2008

    but only light on is 4 wheel drive service and nothing clicks or comes on when pushing 4 wheel buttons

  • jj17 Dec 27, 2008

    says its in 4 wheel drive but nothing happens

  • scottvk Jan 24, 2009

    I tried Mikehumble's solution to the no 4hi engaging problem by resetting the 4wd computer. Now it only works in 2hi (4lo donesn't respond any longer, even though it worked before, bot I could only do 50k). All 3 led's light up when ignition is turned on, now neither 4hi or 4lo respond to being pressed. Any ideas?

  • scottvk Jan 24, 2009

    Oops, I checked again, and I didn't follow Mike's instructions properly. I pulled the cur.light and 4wd fuses, not the atc. I tried it again, pulling the light fuse by the wheel, and the atc fuse under the hood, but I still have only 2wd. The 4wd fuse is fine, but I think my misteak messed something up?? Any suggestions?

  • Anonymous Mar 25, 2009

    yep the exact same problem . i was told their is a way to manually put it in 4 wheel drive?

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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.

Posted on Dec 04, 2008

  • DONALD
    DONALD Sep 23, 2014

    OK SIR I SAW THE ACCUATOR ACTIVATED . I HAVE VACCUM BUT THE PUSH BUTTON CONTROL ONLY LIGHT UP WHENI TURN THE KEY ON THEN ALL THE LIGHTS GO'S OFF AND THE VEHICLE WHEELS ARE IN FOUR WHEEL DRIVE.

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You can also check the vacuum lines and diaphram that are located underneath the battery shelf. Comes out really easy. Check that the lines are not broken. There is a vacuum line that runs to the solenoid in the center of the fire wall, as previously stated by 'speedfreek' and there is an actuator cable that runs to the transfer case. Sometimes it is as easy as replacing the vacuum hose, or the diaphram under the battery shelf went bad. If you ever had a battery leak acid because it went bad.....that acid goes under the shelf and eats those lines.

Posted on Aug 16, 2008

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CHECK THE SOLENOID ON THE FIRE WALL THATS WHAT I FOUND WRONG WITH MINE.ITS ABOUT DEAD CENTER AND HAS 2 VAC LINES COMMING FROM IT

Posted on Jun 09, 2008

  • DONALD
    DONALD Sep 23, 2014

    SIR MAY I ASK THIS, I DID FIND SOME OIL IN SOME OF THE VCC LINES I WILL REMOVE THE LINES DO YOU KNOW THE MUCH VACCUM ARE IN THE LINES TOTAL FOR I CHECK THEM

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Make sure that the pine on the selenoid is not bent!!!

Posted on Nov 22, 2008

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