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Do you hear a clicking noise when you turn your truck on? Its probably the actuator. While the defroster was on I removed the fuse locted under the rear driver side seat. I think its 36B. It stopped the clicking noise and my air vents work well now.
That is one of the mode control actuators in the rear HVAC unit, it is trying to move the mode door but is meeting resistance. You can access that area by removing several screws and removing the panel.
The blend door(s) actuator is more than likely the problem, this is a common issue with this vehicle. The repair is complex, it involves gaining access to the HVAC housing in the dash. Visit www.trailvoy.com and search on HVAC.
the resister block needs changing... oddly enough i'm unsure of what fan you are saying is not working.... if it's the front.. the resister block is located on the duct work under the dash for the air... near the fan... you will see a connector going into the side of the duct work. two screws and the block comes out... should be fairly obvious for the rear one but it will be near the fan.