Truckcom Posted August 5, 2011 Share Posted August 5, 2011 Some time ago I replaced my original Thermo fan for a viscous fan without themostatic sensing thinking it was bad. I later discovered that apparently the earlier fan drive was OK and the overheating was due to a bad connection at the electric fan relay [since repaired]. Anyone got an idea of the consequent fuel mileage handicap. I.E. is it worth installing a new thermo drive? Link to comment Share on other sites More sharing options...
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