My 2007 Multivan aircon is becoming somewhat annoying. I get a sound that I first thought to be a belt, pully or tensioner issue, but, in a moment of inspiration, I've identified that it stops when I turn the aircon off - not all that flash in steamy Brisbane at the moment. I'm disappointed with my service company, because they claimed not to be able to identify & rectify the issue at the most recent service. Then again, they did resuscitate the fan when it went belly up earlier on, so maybe I can give them some slack.

Under the above, am I correct in feeling that it's an issue with the fan itself (a run bearing causing it to touch the housing, or an item that's managed to get into the system)?

More importantly, what's the complexity of heading into the guts of the system & doing my own fix?