Question about 1997 Chevrolet Blazer

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My 97 blazer will go into 4 low but not 4 high it was working fine than i turned it off. went to turn it back on and it wouldnt work.. easy fix?

Posted by Anonymous on

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Posted on Jan 02, 2017

  • 12 Answers

SOURCE: 1999 chev blazer 4x4 system

When you say that the 4wd won't engage, I assume you mean that the front differential is not locking in. If memory serves me correct there is a 3 port vacuum switch located on the top of the transfer case that gave a lot of problems. When the transfer case is shifted to a 4wd mode (high or low) this vacuum switch changes position and routes engine vacuum to the actuator located under the battery tray. This actuator then pulls a cable that move a fork inside the front differential that locks the front diff in 4wd. The vac switch gave a lot of trouble, but any broken vac hoses or differential internal mechanical issues could present as the same issue.

Posted on Nov 23, 2008

  • 1 Answer

SOURCE: 1999 chev blazer 4x4 system

I have a 1999 chevy blazer that stuck in 4 wheel drive. How do you get it out.

Posted on Dec 18, 2008

  • 3 Answers

SOURCE: 92 full size blazer shifts into 4 high and low and won't engage

I have a 93 full size blazer and might be able to help. First you need to ensure that your are actually not engaging the hubs. To do this, shift into 4H or 4L and try to turn very sharply. If it is difficult to move forward with the wheel turned all the way, you are probably in 4WD and the indicator light may be out.

If the truck drives as it does in 2H, your front diff is not engaging. If this is the case, there is a thermostatically engaged actuator that may have failed. These fail occasionally and can be purchased at most auto part stores or at the dealership. Before you buy a new one, use a voltmemter to ensure that voltage is present at the actuator when you engage 4H or 4L.

I know several companies make a manual pull cable style activator that can replace the thermostatically engaged unit.

Lost more info here:
http://www.automotiveforums.com/t173603.html

Posted on Jan 01, 2009

  • 1 Answer

SOURCE: wont swictch back into 2 wheel drive from 4 wheel hi

you could have a split vaccume line goin to the actuater switch that operats the 4 wheel drive under neath the battery box.

Posted on Jan 09, 2009

  • 95 Answers

SOURCE: 1991 S-10 Blazer 4x4 4.3

you need to pull the switch out of the dash and look behind the swict hfor the actuator, chances are the stud that touchs the actual relay is broken use a pen or something slender and long to push it to the desiref position, other than thats go to a junk yard and look for that switch, should just pop out with a lil prying..

Posted on May 19, 2009

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1 Answer

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