I bought this 2005 GMC 2500 Duramax for the main purpose to carry my truck camper (2012 Northland ~ 2700lbs) and be able to tow my snowmobile trailer (~1500-2000lbs) or boat (also ~2300-2700lbs).
It hauls the camper just fine and the trailers are ok to haul unless I am at lower speeds (30mph...
It may be an easy fix, but this is my first dmax. The knob that selects the fan speed doesnt Work on 1 to 4, but comes on full at 5. The fan dont even run till speed 5. I thought fuses but am stuck now. Any other ideas?