I own a 2016 Ford Transit 350HD Ext 3.2L Diesel. My blower went out last November and I just got around to it. I replaced every fuse and relay for the blower motor and even replaced the blower motors itself and the resistor. I hooked it all up and it blows fine on all four speeds, AC is still cold, heat is still hot. My problem is that the air will not come through the vents... it does, but very very very softly, like someone is just trying to blow with their mouth through the vents. One of the issues I think it might be it is that the blower (that I bought from ford, by part number, and even had it VIN verified by the dealership I bought it from) won’t let me tighten the screws all the way. If I do tighten the screws all the way the circular blower blade rubs against the plastic to a point where it won’t move because it’s stuck. I have it tightened just tight enough to where it’s good in the slot but not hitting anything, but it will not blow air though the vents. Am I missing something? Is there a certain way the blower is suppose to sit in it’s spot? My next move is to take a plumbing snake and feed it through my vents to see if any wasps or rats got comfortable in the absence of the blower. I hope someone can help me haha.