Had driver’s side wing mirror replaced after the element went on it. New mirror isn’t heating as well as the passenger side. Took it back to the garage and the mechanic demonstrated the replacement mirror heating well by activating it with VCDS. But it usually doesn’t heat well when I turn the dial to the 6 o’clock position. VCDS shows proper voltage going to the mirror and no faults. I have observed a weird plus sign pattern on the suspect mirror when I first activate the heated element when it is iced over.

Anyone got any ideas? Could the replacement mirror be faulty already?