Jimbo (CA) | August 4th, 2019
I have now had the OEM fan, viscous drive and shroud installed for 6 months and I have proven to myself that if you expect to tow DO NOT INSTALL THIS ELECTRIC FAN SETUP. They work fine for normal unloaded drivibg but will not provide adequate cooling needed for towing. The difference when towing is simply amazing. My coolant and tranny temps no longer creep up on long grades. Yes, mpg might have been a little better but if you have your truck as a TV do not risk cooking the engine!
Jimbo (Southern California) | October 13th, 2018
This dual fan assembly has been installed on my 2003 7.3L Super Duty for several years and it works great so long as I am not towing. My new trailer is on the order of 7000 lbs which is well within the 20K GVR of my truck but the engine will overheat if the grade exceeds about 5%. I installed the fan override switch from Flex-A-Lite and found that it did help a little as I could switch the fans full-on prior to the grade but there just isn't enough airflow to keep the temps from soaring. Keep in mind that the fans draw ~36 Amps from the batt which equates to under 500 Watts which would be 0.67 Horse Power. The stock fan is supposedly 25 HP. I am in the process of changing back to the Ford fan and thermal clutch.