Question about 1999 Chevrolet Blazer

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Shifting into 4wd

I have a 1999 Chevy Blazer 4WD. When I push the buttons to shift into 4wd the indicator light just flashes and then the light goes back to 2wd. Any help with this problem would be apreciated. Thank You Weldon

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  • bbsport7 Dec 13, 2008

    2002 zr2 light blinks, tried to reset and it didnt work.. any more suggs?

  • Stephen Giordano
    Stephen Giordano Dec 15, 2008

    I had the same problem with mine before it was a vacum line that was loose

    Sometimes the line going into the driver side fender can pop off.
    It just uses the air in a box in the fender to pressurize.
    Under the hood on the driver side you will see a couple black thin lines
    check for anything loose. If there isn't anything loose then the lines aren't a problem
    Take off one of the lines and push the 4hi button go and feel he hose see if here is any air movement if not. It could be as simple as changing the little actuator with 3ends on it. Size of a in car cigarette lighter.

  • Anonymous Dec 31, 2008

    i just put a new line on still dont work

  • Antonio Boscia
    Antonio Boscia May 11, 2010

    do you have automatic or manual locking hubs?


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Pull out your courtesy lamp and ATC fuses for 1 minute then reinstall then cycle key on and off 5 times this will reset the 4x4 computer and should fix your problem. and for that question by boscia they do not have locking hubs manual or automatic.

Posted on Dec 04, 2008

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  • 78 Answers

Im dealing with the same problem right now!,on a 96 blazer(I vowed not to keep it,but I kept it anyway)3rd one thats come along with the same "on-off-on-off"indicater lamp issue,and no 4x-high.

these cars have many components which operate the "4x4".
1)vac diaphram under batt.
2)switch on front diff.
3)vac switch on top of t-case
4)acuator motor on bottom driver side of t-case.
5)yards of vac hoses.
6)dash selector switch.
7)electronic controll unit under dash(below heat controlls)

most ALL the times,the prob is,in order.
1)acuartor motor,a manual conversion IS available(takes 5 items off of the above list)
2)vac diaphram under batt.
3)vac switch on top of t-case(if you remove vac tube "cluster"(3-hoses),and you have trans-oil dripping from it IT'S BAD!.

good luck!

Posted on Dec 22, 2008

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