Hello everyone, here is the situation. My current set up in my 1983 c10. 3 core rad, with full shroud, 7 blade metal fan driven by water pump fan clutch, also running a 160 thermostat. Truck is only driven during summer months, temp according to the gauge always hovers around the 160 mark. So onto my dilemma, I got a really really really good deal on some flex a lite electric fans, so I was thinking of installing a dual puller fan set up that's draws 2500cfm inside the shroud where it would cover almost the entire rad except maybe 2 inches on top and bottom. I want to run this set up with a relay and a thermostat switch. I may be over thinking this but I feel as though it may be counter productive. Reasoning is that by installing the thermostat switch that kicks fans on at 185 and off at 175 the coolant never gets back down around the thermostat temperature. Therefore running hotter and decreasing the power that would be gained from not running the mechanical fan. Please help.