I have a similar problem with my 2000 V70 XC, which has about 148,000 miles on it. I never turned the car off when the A/C ran hot, I just turned the A/C off for about 10 minutes. This problem developed late last summer and the Volvo dealer service people insisted I would have to replace the evapora...

I began having this same problem with my 2000 V70XC. It is a different model but my experience so far may give some insight as to how you should approach your issue. My car's symptoms are the same; the A/C runs cold and suddenly blows warm air; after turning it off for a brief period, it blows cold ...