updraught
Well-known member
I've wondered about using a number of smaller fans arranged so they cover more of the area of the radiator than the single one which only draws air through a circle in the middle. Or maybe a shroud would help?
Sounds like a shroud would help
http://www.freeasestudyguides.com/ac-fan-shroud-air-flow.html
http://www.speedwaymotors.com/the-toolbox/fan-shrouds-a-critical-cooling-system-component/28863
Maybe place an electric fan on the outside for testing.
The best part of buying a new radiator is that it should come packaged in a nice box for sending (if there are no "trustworthy" radiator shops nearby).