I just bought an 04 S60 with 51,000 miles. The other day, I started it up, and about 2 minutes later, the fan came on so strong that it made me jump. The fan blew all the way home (1 hour), but with no cooling - just hot air. I played with all of the climate control buttons, but nothing worked (I could not turn the fan off, nor the cool on). When I got home, the fan ran for at least 45 minutes. Today, the air was cool, but the fan would not come on, until I was 45 minutes into the drive. Then it came on and cooled the car down. Again, none of the controls would work. I tried putting it on auto mode, as well as manual.
As a side note - I replaced the battery a couple of days after I bought the car - don't know it that is relevant or not....Thanks in advance for your thoughts!