I'm not familiar with the MAS reason that you speak of. Can you find a Klima relay behind the battery? You don't have to pull the battery to get at it. Simply work the plastic cover out of the way.

Due to the way that the belt wraps around the compressor pulley on these cars, the belt has to be really loose to cause this problem. Not to say it couldn't be the belt, but give the belt a tug with your finger to see if it has any tension at all. If there is any tension at all, then this shouldn't be your trouble.