Aircon failures in V8 Vantage

[PhastPhil]

I'm having an issue with the Aircon blowing cold air out of the right vents whilst the left vents are blowing hot air. This problem just appeared last month and all checks show the refrigerant is ok and the compressor is functioning properly. Has anyone seen this problem before and if so, what is the fix?

[davek_964]

My Cayenne has a similar problem - I've always assumed it's sticking servos.