My 02' V70's air conditioner stopped working last year. I charged it but it leaked out again within 2 weeks. Now that it's getting hot out again I'd like to tackle the issue. I couldn't find any obvious leaks under the hood or compressor area. Are there any common a/c failure prone areas in these cars? How difficult is evap core to replace or even access to check for leaks? Does the whole dash have to come out?