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From this topic: http://www.volvo-forums.com/t29075-06-xc90-heat-blowing-some-cold-air-help.htm

I'm suppose to get this fix via software upgrade but my wife surprised me and said that if you don't turn the temp knobs all the way to max heat, the vents blows hot air consistently. So, I went and tested it out today. Set the temp to red and cranked up the blower, sure enough hot then cold back to hot then cold. Adjusted the temp knobs to about 78 degrees, crakned up the blower and guess what, it works. Hot air all the way. Try it.
 
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