Flex-a-lite Electric fan question

[dyeager535]

I COMPLETELY disagree with both of you guys (no disrespect). When I installed the part #295 in my blazer I noticed about 10* cooler running on the highway. If I had no fan my temps would get wild, even at 60mph.

If the main point is that air traveling at 50-60mph comes in faster than what the fan can pull then........

My Dodge Cummins will also disagree with those statements. My Ram Cummins has enough power to pull most of my trailers over the average hill at 50MPH+. I wouldn't be able to climb those hills without the monster fan that it has. My temp heads strait for hot, until the fan clutch locks and pulls a huge amount of air through the radiator and brings it back down.

I've found that if you have a powerfull fan(s) you WILL indeed notice a difference in temp going fast. If you have a weak fan(s) then, or an easy engine to keep cool, then you won't notice a difference at high speeds.

Like I said, plenty of variables. It very well could be that the Dodges do not allow very good airflow THROUGH the engine bay, thus, there is a huge "wall of air" sitting in front of the vehicle at speed. A fan would certainly pull air from that.

To make it easy, think about the radiator as an individual entity. If it traveled down the road at 60MPH, airspeed throughh the radiator would be near that speed. For a fan to be effective at that speed, it would have to move air FASTER than the speed the radiator (in this example) is traveling.

On top of this, the fan would need to cover every square inch of the radiator to be as efficient as airflow from speed, and any shroud will limit the quantity of air moving over the radiator.

Don't know how you would test the speed the engine fan pulls air at.