Originally Posted by Head2Wind
No, the 5.2" fan will not fit the bracket... and for that matter the 5.2" is a VERY TIGHT FIT if at all on the right side, especially the 990 because of the EFI plug on the frame rail.
I'm not sure that running the fans almost 100% of the time is really necessary, which is most likely going to be the result of having a 160F thermo switch. Keep in mind that typically thermo switches have a ON temp (200) and a OFF temp that is ~20 degrees below the ON latch temp. So, if installing a "160F" switch, that means the radiator coolant temps would need to be at or below ~140F before it would unlatch and turn OFF the fans.... IMO, not optimal.
Then the one god for my test could be the 180F not so aggressive in the charge system, BTW I don't even know if the 160F & the 180F exist for this radiator connector, did you know?
Thanks for the help.