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The "squirrel cage" or blower fan is located on the fire wall behind the dash board on the passenger side. Your problem sounds like it could be a problem with the blower speed switch. I encounterd this same problem on a 2007 Z71. I simply swapped out the entire climate control unit from a doner truck.
Sounds like your fuel/air ratio is running a little rich. You may want to also change out the EGR and PVC valves.
The front hubs were converted to part time 4x4. They now need new bearings.
It might be a burnt fuse. Locate the fuse panel, look on the underside of the fuse panle cover and find the trunk/fule door and corrisponding number. locate the fuse on the panel, pull it out and check to see if the fuse is burnt.
The Mass Airflow sensor would be located on the throttle body or between the trottle body and intake manifold.
There is a knocking sound comming from the front end of the car while turning and a squeaking when i turn the wheels when parked and at low speeds.