Question about 1997 Chevrolet Blazer
4.3 Vortex engine. Was working fine until I put it in 4 wheel High mode and now when I tried to return to 2 wheel mode, the light flashes and a clicking noise is heard in center shifting area. Does not return to 2 wheel mode or go into 4 wheel low mode.
I have had this happen with mine. Backing up slowly, has worked for me.
Posted on Nov 29, 2014
Likely the encoder motor on the transfer case is stuck. there's a bushing that gets worn out and causes this. You may have some luck by trying to disengage 4wd while backing up and engaging 2Hi.
Otherwise you are looking to replace the encoder motor. this involves removing the front driveshaft and a few bolts and an electrical connection. You can buy a new one, or you can pick one up at a salvage yard or Ebay fairly cheaply. The good news is that it's an easy fix that doesn't require any loss of fluid or even the need for a jack or hoist if you can wiggle under the truck. At worst, a pair of car ramps or a set of jack stands and a jack on the drivers side will give you plenty of access...just make sure to chock those wheels and/or set the emergency brake if it works. Hate to have it come rolling down on you while you are under there!
Posted on Nov 29, 2014
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Posted on Jan 02, 2017
After reading some of the fixes here and on other forums,i bought a vacuum actuator and a transfer case switch.My mechanic came to fit these today,replaced the actuator and it didnt do anything.Turned out the old one was o.k..He couldnt find where the case switch went ,so he started tracing the vacuum pipes.
Guess what? he found not one ,but two broken pipes.he replaced/shortened these and hey presto,i now have 2,4 hi,4low and auto all working again.
It may be worth checking the vacumm pipes before buying other parts.
Just a thought...........
Posted on Dec 10, 2008
if it is electronic there is probably something wrong with the wiring..
but if it is manual...it might be the actuator........
Posted on Feb 11, 2009
Pull the kick panel on the passenger side. there is a small box mounted there that is the computer that controls the actuator for the 4wd system. this is notorious for problems due in fact that the connector likes to pull out and away from the module. I had the same problem and the solution is simple.. take a long zip tie and get it between a few of the wires and around the module. tie it in and have a nice day.. it wont come off or try to pop out anymore and you should have no issues getting into 2wd, 4wd h, 4wd L.
Posted on Jun 21, 2009
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