2005 GMC Sierra 3500 Questions

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the 4 wd switch is dead rear windows are dead a/c dead
Lights flash, but don't stay on and the seats don't heat up.
I have removed the wheels, caliper, the axle, and the screw nut in the wheel housing. I see the bearings inside, and the rotor/hub is loose, but it will not slide off. It seems like the bearings are holding the hub/ro...
mileage was at approximately 18,000 miles when odometer stopped
will not show mileage
Do I need to get them repaired and if so what is the best way? Any that I can do myself....
while driving my odometer slowly continued to gain speed as I traveled. It continued faster until it couldn't go any higher. When I stop the engine it drops back to around 90mph and then proceeds higher as I start moving
Changed battery. Now ac switch won't change from defrost to face or feet setting. What is the problem and how can I fix this?