My '99 C230 has an a/c leak. Last year it started and the dealer put in a charge and dye. Ran well all summer. This year, I had warm air coming out and bubbles in the sight glass. Took it to Goodyear and they recharged it and put more dye in it. Worked ok for a few weeks, but now I have warm air again. No bubble in sight glass though. When I took it in earlier this month, Good year said it was a leak in either a hose or compressor as they saw 2 spots under the scope. I want to get this fixed just so I can sell the car. I think I'll take it back to Goodyear, what should I ask them to do? And, if it's a compressor, how much could it cost to fix and since I want to sell the car, should I even bother or sell it as is?

Thanks,
One unhappy Mercedes owner