I have a 2007 XC90 (V8). I live Eastern Ontario which gets pretty darn cold in the winter months. When I set the system to blow warm air into the passenger compartment, the air flow on the passenger side blows warm then cool then warm then cool while the air on the drivers side just blows warm. It's not an issue for me as I sit on the drivers side...however, my wife is not impressed. Eventually, the warm then cool air flow evens out to just warm but, we're not usually in the vehicle that long.
Any idea's on why this is happening and why only on the passenger side?

 

there may be fault in the CCM system, you need to hook up vida to see if there is any ccm software upgrade available or it may just need a ccm recalibration.

 

Thanks for the info. I'll need to book some quality one on one time with the dealership techs to sort it out. At least if I walk in and mention ccm, they may think intially that I have a clue about what I'm talking about... but only initially.