get the strongest biggest one you can get.

IMHO you will never get the airflow that a viscous fan offers. i went through this recently

http://www.pajeroclub.co.za/forum/viewtopic.php?f=27&t=1382



Karma's Law - For every action there is a multiplied reaction!
93 Pajero GLS 3.0 V6 LWB - SOLD
2001 Gen3 Di-D LWB - SOLD
2005 Touareg R5 2.5 TDi