alert!
I'm the opposite.. did biology at uni and several years as a microbiologist... then got bored and went into business and accounting! Fully qualified and everything now! yawn
Anyway.. back to this fault
I don't think it's a fault, I reckon it's a feature. I can't speak for the pre-facelift but my facelift does exactly the same so I really don't think there is any need to worry
If it still does it in the summer when its 30 degrees outside then there might be something wrong