I have just gotten myself an E34 520i year 95 single vanos and it feels good however I do have a problem, the previous owner's mechs were not able to determine the reason for the problem, so here I am, The problem is that sometimes when I start the car after having driven it, the temperature needle jumps up to the red point, then what i have to do is rev the car with the aircon off and the temp comes down. This also happens when I'm stuck in a jam sometimes and what i do is turn off the ac and rev the car and it comes down quite fast. The fan clutch is new, radiator is about a year old and all the hosing seems fine, dont know if it is an electrical problem. Anybody encounter the same problem b4? Feedback would be much appreciated. Thanks all in advance.