+250 Degree Engine Coolant, Electric Fan?

[MMcCallie]

Though i know the Flex-A-Lite electric fan kit for diesels cannot move but about half the air a mechanical fan can, i've been finding my clutch fan totally insufficient when 4 wheeling in the mountains. When rock crawling in low range, turning very low RPMs, i cannot even tell from inside if the fan is locked up by ear. I have a small electric fan that does very little, but just enough to be worth having. I can tell it is on by all of the dust blowing from underneath.

When last trail riding around Estes Park, it was 100 degrees that day. My engine coolant was climbing over 250 degrees. I had the a/c on, and when i would turn it off, the coolant would drop back down to 210-220 within a few minutes. The coolant temp wouldn't drop below 210 until i either stopped and shut the engine down for a few minutes, or got on the highway again with airflow cooling things down.

During normal cruising the coolant sits around 180-195. In stop and go traffic it will get up to 210 and the a/c doesn't blow cold anymore. I drive a lot of stop and go. On the road i can usually hear the fan locking or letting go but not when 4 wheeling under 6 mph.

Since i drive an extremely heavy truck regularly in the mountains in 100 degree weather, i want to make sure i won't overheat running the electric fans. I rarely tow, though it is usually around 10,000 lbs. I'd be using kit #278 in addition to the 18" Be Cool i have in front of the intercooler.

My transmission temperature also gets out of hand. On the interstate it may be as low as 146 in 80 degree weather when the torque converter stays locked. However, in stop and go traffic it gets over 200 degrees and there's nothing i can do about it then. Same thing happens off road, though i often lock the torque converter in 1st gear when crawling in low range.

Will the Flex-A-Lite #278 make a huge difference for my engine coolant, transmission fluid, and a/c when there is no other airflow? I don't want to burn up my compressor so i usually turn it off when the coolant climbs above 210. I don't like having to always leave the windows down off road because that makes for an awful lot of dirt to have to clean on the inside of this beast. Has anyone noticed a great improvement in cooling with electric fans when barely moving?
Thanks,
Matt