Chevrolet Repair: 98 Blazer 4x4 engagement, 4lo, troubleshooting guide

Question
Van
Thanks for your help.
I have a 1998 S-10 4 door 4x4, or rather it used to be a 4x4...  I have 130K on it and the encoder motor was changed at around 75k.

When pressing the 4 hi or 4 low button the lights for the 4 hi and 4 lo flash at the same time and nothing happens.  Last time I played with it I got the transfer case into 4lo but I do not think the wheels were engaged.

Last year I remember it having trouble disengaging the right side.  Not sure if this is related.

Any help what test to run or part to change.

Thanks
Mark


Answer
Hi Mark,
Check the following links. They have a troubleshooting guide, and a description of how the system operates....except I disagree with them that the left side always drives, because there is a differential inside, so neither side drives unless the actuator engages.

I have not tried one of these...I stay stock. But it could be helpful reading.


http://www.4x4posi-lok.com/PDFs/troubleshootguide.pdf

http://offroadltd.com/Merchant2/merchant.mvc?Screen=PROD&Store_Code=ORL&Product_...

Van