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THE ACUATER IF ELECTRICAL YO SHOULD HAVE DISCONECTEDE THE BATTER BEFOR YOU DISCONECTED IT AT THE 4 WHEEEL DRIVE IF NOT THEN YOU WILL NEED TO REPLACE IT AS THEIR IS NOT RESET ON THEM. I HAVE DONE IT MYSELF MANY TIMES IN PAST.
well typically is there is a noise when making a turn its caused by a bad cv-joint but if your having problems with the 4 wheel drive i would look at the linkage to the transfer case and make sure there is not to much play or bent or broke rods and stuff.
my 89 light is always on to,but its not in 4x4 mode,its a vacume problem.the shifter should be in 2h.to test if its stuck in 4x4 turn the wheels to the left or right all the way and try to move a little if it feels like its binding its in 4x4.if not you ok.
Just pull up on the 4 wheel drive lever .. You can shift on the fly to part time and full time but you gotta stop and in park or neutral you can shift into 4 wheel lo .. I have one myself .. love those jeeps .. you "understand"
I do not have a vacuum diagram for the 89 Cherokee, but my 89 had the same issue several times and all it was is that the block of vacuum lines that go into the front axle on the rear of the axle on the passenger side of the vehicle. I ended up having to put a zip tie around the axle and hose block to hold it on. Have not had the issue again since doing this. Hope that helps.
Do you have manual lock in hubs??? Alot of these work off of vacuum. check you hoses, and also a pull off valve which enguages the front end. One bolt to replace this the valve the enguages the front end.
The defrost has leaves in heater box , blocking air flow on pasenger side most likely???? Check it out.