OK. This extra hot summer has convinced me to really consider an E-Fan. My questions are, what is the biggest cfm/size single fan for the 4.7? And who sells it? thanks.

 

Flexalite Black Magic series move alot of air, the 188 moves 3,300 cfm.
http://cgi.ebay.com/ebaymotors/Flex-...Q5fAccessories

There is also the Chevy HHR fan that pushes around 3000 cfm.
http://cgi.ebay.com/ebaymotors/2006-...Q5fAccessories

 

I am thinking that you should go with the 3300cfm fan for your hotter weather. This weekend took a trip across a couple mountain passes with the new efan I just put in. Supposed to be 2500cfm. Pushing it hard up some of the hills, keeping up with the old mans cummins, temps were running up there a bit on the temp gage(between the 1/2 line and the top black line) and it was not even warm out. Out door temp was in the mid to high teens *C or in the 60's *F most of the day. I know when we do get warm here and I start pulling my trailer, the fan will not keep up it seems. I might have to go to a larger CFM fan.

 

3300 cfm Flex-a-Lite in my Ram. Have pulled a 7700# tractor with my truck in the hot south Georgia summer and not had my gauge reach the half way mark...

Also not a bad idea to go to a lower temp thermostat. IMO the cooler the engine temp is when the thermostat opens and lets coolant in, the bigger jump you have on keeping the engine temp cooler...