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Originally Posted by f5fstop
Other point, if you are driving at speeds above 30-40 mph, no fan in the world can draw any more airflow through the radiator, than what is being pushed in by the movement of the vehicle.
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I don't know about modern trucks, but in the old days (70's, early 80's), there were some clutched fans on GM's Heavy Duty Cooling Systems that would drop radiator temperature even at 60-65 mph. It sounded like a jet engine when it engaged, and I believe it took about 10 hp to run. That might be a bit much for the little H3 engine.
I think the aerodynamics are better on today's vehicles with respect to cooling system air flow, so such "big mutha" fans aren't needed.
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As I told someone on another thread, if the sensor is ok, have the dealer to a drain and then a Vac-and-fill of the coolant system. If there is a possible air bubble in the engine, it can cause overheating, and this has been a problem with some of the Ecotec 4-cylinder engines.
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Do all of the dealers have "vac-and-fill" systems now?
It can be a real bear getting some cooling systems voided of air, and it definitely can cause overheating. Some GM vehicles have air bleed valves which help some.
Michael