here is some info on your system, do you have A/C experience? Do you have the vacuum pump to evacuate the system and the gauges to do the re-fill correctly? You may be low on freon, because there is a leak in the system. These are some things to consider.
i had a friend charge my ac from the "hi' side and it worked temporarly. i was later told that the 'low' side is where its suppose 2b charged. Which is true? Hi side or low side? its a 1999 mercedes ml430.