I have a 2000 Excursion and it appears the AC lines going into the condenser are leaking. I had a local shop replace them, vac and recharge the system for 96.00. The ac was never really cold, and he used a vac pump and gauges to recharge. He said he thought there was enough refrig in the system for me. I got tired of just cold air so I put a small bomb in the system tonight and woah, I had ice cold air again. I noticed that where he replaced the O-rings, it appeared to be oily again! WTH? I went to a friends house and he as the glasses and UV light and we could see the dye around the connections where the hoses bolt to the condenser. we cleaned em off with brake cleaner and will recheck tomorrow afternoon. How odd is it to have the O-rings replaced and then have it leak again? I know he did not use OEM O-rings. I do not think its the condenser, we can only see the die on the fitting and around the flange of the hoses.it is easy enough to replace the condenser and it is not labor intensive. I called the shop and he said it would be about 25.00 plus a recharge but he doesn't know its leaking AGAIN. Should I go and replace the condenser as well? This image doesn't show the lightly wetness around the flanges.... but here it is.

 

actually you can see where the metal is darker near the base....that's the leak again I believe.