The fan for my side mounted radiator comes on at 210 degrees and shuts off at 195 when I'm ascending a grade. So it's temperature activated. It does not run at low speed under any conditions. When the fan is running it obviously takes power to run it and that is supplied by the engine driven hydraulic pump, so it does "steal" power from the engine.
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Bob Retired Army Traveling alone now, had to put Charlie the Beagle down :(.
2008 Camelot 40 PDQ 4 slides ISL400 towing a 2020 1500 GMC Sierra Denali 4x4 Crewcab
Western MT in summer, AZ, NV in winter
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