Quote Originally Posted by VX KAT View Post
Actually, Bill Williamson at RD Radiator advised me against putting an auxilliary fan on as it would actually cause a decrease in air flow as it actually blocks airflow and only about 30% gets through.
http://www.vehicross.info/forums/sho...1&postcount=19

And it was the same for me basically, my problem wasn't fully resolved either until I replaced the fan clutch (and redesigned fan blade).

I went with OEM cuz somebody mentioned they'd tried several aftermarket f.c.'s and they'd and their overheating wasn't resolved until they tried the OEM f.c. Think it was VXorado.
The FF Dynamics electric fan I tried actually replaced the stock fan with fan clutch and the fan shroud, but it was not strong enough for the thicker Ron Davis aluminum radiator. The "auxilary fan" added to the front of the condenser (not the radiator) actually does help keep the A/C compressor happy in hotter weather. Two totally different things though. Auxilary fan cools condenser (A/C) and main fan with clutch cools radiator.

I got a $90 fan clutch from AutoZone and it is working better then the stock one ever did (hopefully it will last). If we order a new fan clutch from Isuzu we are forced to get a new fan and fan clutch, I believe Merlin quoted me somewhere just above $300 for both because our older design is not avaliable anymore.