I just had the first squealing fan belt yesterday. It was 90 Deg F with at least 98% humidity. It started right after starting up the car and when I started to back out of the drive it was really loud. My neighbor about 3 houses down turned to see what was the racket. It lasted about 20 seconds or so, then went away. Embarrassing with a $50k car!
If it happens again I'll take it in to get that adjusted. I had the chance to hear a freinds D recently and have noted my A/C compressor is definitely louder, so I suspect something could be going on, especially with the squealing belt. Almost always a sign of trouble coming up.
2010 Black 335D Sport/Premium, Michelin PSS 235/265
2000 Silver Z3 3.0i (Ret)
1999 Silver R1200C (Ret)
1968 Black 1600 Coupe (Ret)