[Vwdiesel] AC woes

[Ethan Vos]

I need a little help here.

I have a 92 turbo diesel. When I turn on the AC the tach drops 500 rpm
or so. This, along with the fact that I hear a belt squeal when the AC
is on and the car is cold would lead me to believe that the belt is
loose.

It isn't. In fact, the previous belt was over-tight to the extent that
it broke after about 2,000 km.

Is it possible for the AC system to be overfull of Freon, thereby
putting too much of a load on everything? If so, how would I check it?

Ethan