That is a bit interesting. Now by putting a larger load on the motor which makes it run hotter, it also turns on the second fan. I guess the question is, which way makes the engine cooler? Just the heater running or running the AC?  The AC won't cool the engine at all, but the additional fan pulling on the radiator would.
95 Contour, Custom EVO bodykit, 2.0l, PNP Focus head, Stage 2 cams, Je pistons, Eagle rods, 4in1header, 2.5" header back exhaust(complete stainless), D P nitrous, ram air intake, 10mm wires, flamethrower.
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