My buddy took the stock one out and broke part of the plastic that keeps the blower motor air tight, i went to murrays bought a new blower motor and went to put it in but if i screw it in the where it is air tight it wont spin to create air, even after i fixed the plastic leak where the air was escaping it is doing this and i cannot get enough air to come out to heat the car up. Is there any fix for this?