I had the same problem, & yes I feel your pain, every1 thinks your car overheats, when you know it doesn't!!!! lol I got an auto-electrician out in the end. It was a coiled wire resistor located just above the front bumper (remove the plastic trim), which, when removed had visibly blown & a piece was missing (very easy to identify) It is definitely this that's the problem, with me anyway. (1st fan speed not coming on, so the faster one kicking in at 90) Got a part number for it somewhere, just pm me if anyone wants it. Matt