I had a voltage dip to about 11 vdc today. Thereafter my radiator fan quit working and I did not notice as I drove around town. Once I got on the highway - then I noticed the engine temp at 255°F! Yowzy!! I slowed down to about 55-60 (~1850 rpm in OD) and the temp slowly trended down and stabilized at about 200°F so drove the ~20 miles home. I was suspecting the suspecting the fan since once I was cruising at low rpm and 60 mph the temp just trended down. I got home (my only purpose at that point) and verified that the Mark-8 fan was not functioning. I put the car away to let it cool off to come back later. I later came back and verified that the fan works when 12 vdc are applied directly. As I was troubleshooting I also remembered that I had installed an "override" switch as I looked around the passenger side under the dash (yeah- it worked promptly energizing the actuating fan relay immediately--I coulda used it if I remembered ). Anyway- it appears that I am not getting a "full" voltage signal from the ECM to actuate the fan relay...so it does not PICK-UP when required. I don't think I ruined the FAST EZ-EFI 2.0 because the engine ran like a dream-- even when it was at 255°F. And yes, it was really 255°F, from the EZ-EFI indicator and my separate and independent dash gauge.... Any pointers before I tear everything apart?