Originally posted by Thunderbucket
A Flex fan will give it's maximum cooling at the lower RPM ranges,road speed dont matter,but they are noisy as hell,,,,it's way better to put a Clutch Fan in there instead.
I have three, one in my '73 F100, one in my '66 Mustang, and one in my '75 Duster. Never have had a cooling problem and they are quite a bit quieter than a wobbly clutch fan