[redcoats1976]

Originally Posted by '10CamaroDude

If it were metal, then the motor would break instead of the door. Yeah,
easier to replace than that huge flapping door..

The reason the doors are breaking at the motor end, is because when you
go full cold, to the BLUE dot, the door stops, but the motor keeps twisting
on the door. Eventually, it twists off at the door end. There is a video out
there that shows this. So, you have to stop two hash marks before the
cold blue DOT so it doesn't keep twisting on the plastic when the door
goes as far as it can, but the motor will keep torque on it.

got it,i will remember to stop two clicks before full cold.