[leddzepp]

If it is spinning faster in the ACC position than it is when in the ON position, something is wrong. The fan should spin at the same speed regardless of the position of the key. I had this problem a while back, and when the fan spun too fast, I could smell burning after a while. I replaced my relay and the problem was solved. I do not know if that will solve your problem, but I think it is worth $10 to find out if nothing else is solving the problem.