I purchased a Horton fan clutch for my 92 Dodge in 1993 based on my experience with Horton on heavy duty trucks. The 92 radiator was marginal for the Cummins engine and the Horton did a good job pulling air across the raidator. Even with air temperatures of 100 degrees and the air conditioner on, the fan cycled off and on while towing the 5th wheel trailer. I had very good results with the Horton and sold it to another TDR member when I traded the 92 for a 97. He has since traded trucks and sold it to another Dodge/Cummins owner and it is still the running today.
I have not purchased a Horton for my 97 or '00 truck because the radiator is sufficient size for the Cummins engine. One thing I was amazed about the Horton on the first generation truck was the small amount of time the fan was actually engaged.
On the Horton that I had, the fan engaged when the coolant temperature reached 203-205 degrees which is when the thermostat is fully open. The only way you could adjust the open and closing is to change the sensors. (Heavy duty truck dealers carry the different sensors) If the fan engages before the thermostat is fully open, the fan is running needlessly. You could always override the sensor with the manual switch on the dash.
I used the Horton as a cooling aid and only for that purpose. If it saved fuel, it wasn't that noticeable. However, the fan did run very little in the cooler months.
If my present truck needed a coling aid, the Horton would be the next thing to be added. I had nothing but good results on the 92 with the Horton. I would buy another one in a minute!!!
Bill
------------------
Y2K 3500QC, 6 Speed, 4. 10, SLT+, Camper & Tow Pkg. , Westin Chrome Nerf Bars, Mopar Flaps, Reese 20K Hitch, V-A CPC, EGT & Boost Gauges, RPM 45 Gallon Aux. Fuel Tank, Highway Products 5th Wheel Toolbox, ECM Controlled PacBrake, Painless Wiring Kit, Mag-Hytec Diff. Cover, 80% Towing Hitchhiker II 31', 2 slideouts, 19,750 GCW