Quick and simple:

Where is the AC Compressor on 300TD 1980, and how would I add freon to the system without killing myself and half the neighborhood in the process.

Also, what would cause a constant grinding noise coming from the right rear side of the car... parking brake locked on? Im also getting squealing and grinding noises from the front brakes especially the drivers side. (I can feel under my foot like its grinding against metal even when Im not using the brakes)

Help appreciated.