I have 2011 GMC 2500HD w/7K. When I put the plow on and drive about 3 miles I loose the heat inside the truck. Engine temp stays normal but the exterior temp goes up and as the exterior temp goes up the interior heat fades away. If I put the plow close to the ground 2", the exterior temp drops and heat comes back. I have tried it on auto climate as well as manual controls. Dealer cannot figure it out and says it is too hard to move temp sensor. Does anyone have any ideas on how to fix this problem, I,m cold.
