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My Jimmy is push button 4wd. it will go into 4 low but will not go into 4 high.the light in 4 low will light but nothing in 4 high an it will not lock in.Any ideas?
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This sounds like the auto locking hubs have gone out. They will sometimes make a ratcheting noise and then seize up. This time of year especially with the colder weather they will lock up when the grease gets old and hardens. The best thing to do is to replace them with a nice set of Warn manual lock-out hubs. There are some special sockets you will need to do this repair so it might be best to take this one to a shop.
Hummers are 4WD all the time, you can never take it out of 4WD. Now, you can select between locked 4WD HIGH and locked 4WD LOW. Those are switched by putting the vehicle in Neutral, and pushing the button the dash, waiting till the correct indicator light illuminates and then putting the truck in drive. Based on the above info, what exactly kind of 4WD drive problem are you having?
sounds like the vacuum lines are either pinched or the vacuum pump is shot. try getting a mechanic look at the lines on and around your transfer case... also try checking the fuses for the 4wd selector. let me know how it goes
are you setting still or driving when ingaugeing the 4 wheel drive if you are setting still try putting it in with vehicle moving if it does not light up steady in 4wd then it is not going in 4wd
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