Car: 1991 560 SEL with R12 system with a working compressor
Problem: A/C not very cold.
Test: injected UV dye with additional Freon

Upon putting a blacklight on the compressor, I found it is totally covered by the yellowish dye. I mean the whole compressor lights up like some one painted it one side with this UV dye. I am going to spend some more time tonight to study the leak a bit more and I need your advise.

How should I go about checking if the dye is just from the connectors on top of the compressor? What could explain the fact of large area of even dye deposit?

Thank you.