I was having an issue with my blazer. when I bought it the guy said the 4wd was messed up and that it had 4low but nothing else. Well, It had 2 low not 4low
Took it to a buddies shop, and checked into it, actuator looked fine and was engaging properly, lines were good. We replaced the switch in the t case (the one that the lines hook up to) and I was able to have 4low but no 4 high. the push buttons would flash and act weird. Bought a transfercase control module (TCCM) and an encoder motor from a member on here. Had a fun time finding the TCCM on my 1995 blazer (behind the dash under the radio) replaced that, and seemed fine in the shop, Took it out to the snow, and would not work (still had 4 low and 2wd) replaced the encoder motor and my 4wd works great now.