I would change the thermostat ,and flush and fill the radiator before I messed with the clutch fan.Dont top off the coolant level all the way to the rad. neck opening .It should be full at a couple of inches down.How many core rows are in your radiator? Maybe you could increase to a 3 or 4 row Radiator.
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1972 C20 cheyenne Super 402 BB/400 turbo LWB A/C Tilt, Cruise Control, Saddle tanks, Tach
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