2001 330 ci premium and sport options manual trans 65K miles At times the fan seems to go through a rapid non-aggressive cycle of increasing and decreasing - both in automatic and manual modes. Additionally, at times when the ignition is turned off and key removed the fan continues of run at a very low speed. Sometimes it stops on its own after 20-40 sec. Other times I have to manually turn on and off several times. All other aspects of the A/C and heat appear to function properly. I suspect some sort of control issue - any idea where and how to adjust/replace?