Join Date: Jun 2006
Location: Eastern ON Canada
Car: 07 OBW 2.5i D-4AT
Feedback Score: 6 reviews
The belt appears to be one groove back on the alternator, and two grooves back on the compressor, as well as back on the 5 O'clock idler pulley.
If that bracket is out of alignment, it might shift the idler (mounted by a bolt to the bracket) such that the belt moves to the back of the pulley. That could cause the belt to move back on the alternator pulley, which is fairly close. Also, as the compressor appears to be mounted to the same bracket, the misaligned bracket would disorient the compressor pulley. (The diagram also appears to indicate the alternator is mounted to the bracket but that's not clear.)
For example, if the bracket is tilted down at the front, that would cause the belt, coming from the p.s. pump pulley, to move toward the back of the idler. And, as the belt crosses from the alternator pulley to the compressor pulley, with the latter's pulley tilted down, the belt would again tend to move toward the back.
It looks as if the bracket is held on by four bolts, (but it's not clearly so). It's unlikely all four would have loosened and perhaps some fall out. But I'm with CNY_Dave on perhaps starting by checking the bracket position more closely.