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 I've got a 3 core with a 16" puller that puts out 3948cfm.  On the road at 35 or faster I don't even need to turn the fan on and it runs at about 180+/- ....only during cruises at Hot August Nights when the temp is 90+ does it get to about 210 after I've been in bumper to bumper traffic (5-10mph) for about 45 minutes or so.  At that point I think the problem is evacuating the heat out of the engine compartment.  
 Tom
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