I've heard a lot of folks say that, and maybe that is an issue with single fan setups but at least in my mind, I'm pretty sure a ton of air flows through these 2 giant holes when fans aren't spinning
. I've never had any cooling issues. I just rolled over 5300 miles now on it. I have a stock 195° thermo installed and I built the GM 3 relay fan setup. With the A/C cranking on a 99° day it stays right at the 195ish mark. Same goes for any other scenario too I guess, stays under 200.