Attention: TDR Forum Junkies 
Originally posted by Joseph Donnelly
A while ago I dyno tested stock fan vs. no fan, wondering what the Horton might gain me. 4 hp, yep the stocker turned out to be a real power robbing menace to a 600 hp Cummins
Hope this helps you with your decision.
From a power-only perspective, it's a no-brainer. Keep the stock clutch and fan.
But from an A/C cooling perspective, the stock fan clutch just doesn't cut it in in-town driving. It doesn't move enough air to remove heat from the condenser.
Now, this may not be true of vehicles with under 50K miles or so, but when the mileage gets higher, for some reason the stock fan clutch just doesn't run the fan well enough to remove heat when stuck in town, when the ambient temps are over 90F and the humidity is high as well.
I *never* had really bad A/C problems until I reached around 100K miles. Granted, the A/C never worked well to begin with, but once I put enough freon [sic] into the system, it has been cooling great when my speed is over 35 MPH. It's just during slow, in-town driving that the A/C su... er, leaves a lot to be desired.
Having looked at the prices of electric fans, a Horton clutch is not all that much more. The only trick with either solution is to have it turn off when the truck is moving faster than 35 MPH or so.
Actually, I'm *real* tempted to adjust the bi-metallic actuator to get the clutch to engage at a lower temp and stay engaged longer. *That* might do the trick.
Fest3er
