Hey guys. I almost have my bimmer's overheating problem taken care of. It seems to help when I have the aux radiator fan blowing at all times. What can I hook it up to so that it runs whenever I turn the car on? Also, is it normal for when the car starts to overheat that coolant bubbles out from under the radiator reservoir cap? I didn't remember that happening before I had these issues. I took the cap out and the o ring in it and everything else seems intact. I just wanted to ask before I spend $25 on the stupid cap. THANK YOU!!!