Question about 1999 GMC Jimmy
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Posted on Jan 02, 2017
SOURCE: intermittent 4wd on 98 jimmy
the module is what i would suspect. and i do believe it is in the r kick panel. i've seen the button pack on dash go bad too, but module is best bet.
Posted on Nov 16, 2008
sounds like it is loosing vacuum check all the lines for a crack even the engine lines will cause it to loose vacc. pressure. if it is not run to the vacuum reserve canister you may not have enough vacc. to hold the actuator in several times I just run new lines and that helped and not very costly.
Posted on Dec 25, 2008
SOURCE: My 01 Trooper had problems
We have a 1998 Trooper that had the same problem. The fix was an electronic switch for the 4WD - a vacuum sensor - on the front axle that just plugs in. You can see it - if you look under the car from the front, it's mounted in the middle of the front axle. It cost $175 from the dealer. We had somebody install it for $50. Don't know where you live, but they are exposed and can corrode. That's what happened to ours. Good luck - hope it's the same problem. This was an easy fix, and we were pleased.
Posted on Jan 16, 2009
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I had the same problem with my 1999 Silverado which would blink several times on the mode I selected then go back to the 2 wheel High. I found the switch module to be defective, after replacing it I have never had the problem again.
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