Just bought a 2008 passat wagon. Ac was not cooling correctly(sometimes cold air sometimes luke warm air) and my mechanic found that the compressor was the problem. Well after replacing old compressor with factory replacement the ac is doing the exact same thing. Blowing luke warm air. I feel the compressor was not the problem. Could any other possible part cause this to happen? Like the RCV? Thanks. Any help would be very much appreciated.