The simplest cause could be that she has accidently opened the fresh air intake that lets the center vents blow untreated fresh air while the rest of the system is blowing treated (heated, etc.) air. There is a wheel adjuster to the left of the center vent that does this - not the one that opens and closes the vent itself, there is a second wheel on the left side only. I forget which way it moves to let in fresh air, because they go in opposite directions between the 850 and x70 for some reason. This is also in the owners handbook, if she reads that.
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Mike Sullivan '07 XC70, '95 855T (100k), '95 855 NA (148k). Past Volvo's: '85 744 (256k), '86 245 (165k), '86 245 (195k), '88 745 (208k), '91 745 (196k), '93 965 (147k) , '98 V70XC (98k).
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