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instarx · 01-09-2009, 05:33 PM

You didn't say anything about your truck - weight, size, horsepower, engine type, etc. All are factors in choosing a fan. If its a diesel, forget about electric fans, particularly since you tow. If you go up mountains in low gear, make sure you can get get enough fan for the duty. Thin air at 10,000 feet doesn't cool as efficiently as air at 5,000 ft. No electric can pull the same amount of air through your radiator that your current 250 hp fan (engine) will pull. If its over-sized you may be ok - if it's barely adequate no electric will work for you. You have to size your fan for the most extreme situation you will encounter as well as for cooling system degradation over time..

There is an electric fan selection guide at the flex-a-lite.com site.

01-09-2009, 05:33 PM	#10 (permalink)
instarx EcoModding Dilatant Join Date: Jul 2008 Location: NC Posts: 262 Volvo - '00 Volvo V70 XC AWD SE 90 day: 27.7 mpg (US) Thanks: 4 Thanked 27 Times in 17 Posts	You didn't say anything about your truck - weight, size, horsepower, engine type, etc. All are factors in choosing a fan. If its a diesel, forget about electric fans, particularly since you tow. If you go up mountains in low gear, make sure you can get get enough fan for the duty. Thin air at 10,000 feet doesn't cool as efficiently as air at 5,000 ft. No electric can pull the same amount of air through your radiator that your current 250 hp fan (engine) will pull. If its over-sized you may be ok - if it's barely adequate no electric will work for you. You have to size your fan for the most extreme situation you will encounter as well as for cooling system degradation over time.. There is an electric fan selection guide at the flex-a-lite.com site. Last edited by instarx; 01-09-2009 at 05:39 PM..