1999 Volvo XC70 Leak

Have you done an A/C perfomance test? What were the low and high side gage readings? Are you out of refrigerant again? If you are, get a black light and look closely at the condensor especially near the high side service port. Have seen the condensors leak around there. Also shine the black light at the firewall where the lines go into. If there is dye then the seals are leaking behinde the aluminum cover. Shine the black light towards the front of the compressor also. Make sure the front seal is not leaking there. If no leaks are revealed during the inspection then the evaporator could be leaking but to inspect that the climate box needs to come out. Another issue with the A/C not blowing cold is a worn compressor clutch but for the most part, at the beginning you do get cold air and then it starts to blow warm air.

The low side fitting is under the coolant reservoir and the high side is on top of the condensor on passenger side. Like I mentioned earlier, look right there on the condensor for green dye leaking around there on the sides.