Looking to install and electric fan on my 2004 Silverado K1500 and have a couple questions. First, what kind of cfm and I looking for to keep the 5.3L sufficiently cooled? The other thing I was looking for advice on is setting the fan up to be automatically controlled. The wiring kits I have looked at come with temperature sensors, but where are they to be installed. I noticed a plug on the rear of the passenger head. Didn't know if this would be a possible place for the sensor? Any advice would be appreciated. Thanks.