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Originally Posted by Skyco
2 caveats on reversing an electric fan- first make sure the motor can run in reverse- many DC fans cannot due to electronics in them. Second- most high efficiency fan blades won't move air near as well in the reverse direction. In that case, assuming the motor will run backwards, I'd mount the DC fan so the best air movement is the same as stock- back to front for hot weather use. That way when overheating is less likely in cold weather you are moving (colder) air in the lower efficiency direction....
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Skyco-
I thought the same thing and I am with you 100% - the lower volume might also help not "cook" the sap driving it (me) also. I don't have any experience with electric automotive fans, anyone know if they will run backwards? Many of them say "Reversible" but I don't know whether they are talking electrically or how they are physically mounted.