I put my 99 chevy s-10 blazer from 2 hi to 4 low this morning to get out due to bad weather, when i got to the highway i put blazer in neutral and pushed 2 hi button and the button would not push in or move at all. so i pushed from 2 low which it was currently in and tried 4 hi and it went into that fine, but will not go from 4 hi/low into 2wd at all?
You could have a split vaccume line goin to the actuater switch that operats the 4 wheel drive under neath the battery box.
I have worked in GM dealership. The first thing we would do as inexpensive normal maintenance is change transfer case fluid. Once it is changed drive it until warm taking turns. Then drain it again and refill. This type of flush usually helped with any tarnish. It helped because four low is rarely used.
Most likely a bad encoder motor. These were very common problems on the S series trucks. Unfortunatly not a cheap fix either. Usually around $450 - $550, more at a dealer.
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Have the same problem will not shift to 2 wheel drive . light blinks and can hear it trying but wont shift
i have the same problem my blazer is a 97 though
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