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?
Relay or fuse, possible fusible link.
SOURCE: 2006 H3 Hummer AC/Heater Fan Motor
I brought my 2006 H3 in to the dealer for the same thing. My blower stopped working all together but it started as an intermittent problem. He said he had to replaced a diode or resistor either behind the switch on the dash that controls the fan or on the fan motor itself. Have not had a problem since but that was only about 4 months ago.
SOURCE: my 2006 f250 pops in and out of 4 wheel drive by
if the front axel seals are starting to leak this could be the problem,very common. the 4WD on this vehicle uses vacuum to make the system work=leakings seals low or no vacuum no 4WD.get back to me if you need more help,PLEASE rate my fix as i strive to be the best Thanks Ray
SOURCE: 4 wheel drive h3 turn off
It dosnt trun off it is all wheel drive, just make sure you are not in 50-50 or low you will be cool ive been driven one sence 06
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