The mechanical fan in C30x’s is really loud. Especially when cruising at 50+mph — and that’s when you don’t need the fan running at all. I got a Flex-A-Lite 12V DC fan – It’s rated at 3000cfm. I also got Flex-A-Lites variable speed controller. This controller will run the fan at 60%-100% speed depending upon coolant temp. It has a number of other cool features, such as soft start, variable temp threshold, and running for a brief period after the ignition is turned off.
The 3″ thick civilian radiator was pretty beaten up — various impacts had smashed the cooling fins. Also some impact had split the welds on the frame. It turns out that a cheap plastic scraper from Harbor Freight was the perfect tool to realign the cooling fins.
I had to fabricate and weld some brackets to the radiator to attach the fan. The whole assembly barely fits after rerouting the air intake snorkel. There really isn’t a lot of extra space in the front of the C30x.
I can’t test it out until I get the CV boot installed and the brakes fixed…