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  #1  
Old 07-27-2004, 02:19 AM
DHA DHA is offline
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Auxiliary Fans

For a 1990 560SEL, having twin auxiliary fans forward of the radiator, will someone please advise what is the correct direction of fan rotation (clockwise?counterclockwise?) when standing in front of the fans and facing the driver?

Thanks
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Old 07-27-2004, 02:57 AM
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Clockwise take a small piece of paper and hold it in front of the fan when it's running it will be pulled toward the fan . I have all my MB's fans wired with a switch so I can control them.......

William Rogers.........
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Old 07-27-2004, 07:57 AM
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Makes sense to me. Does anyone have a thought on why, having replaced the drivers side (left) aux. fan, the direction of rotation is now counterclockwise. I tried swapping conectors between the fans; tried operating one or the other fan separately. In all cases, direction of rotation is now counterclockwise, whereas I am all but certain that prior to this repair, rotation was clockwise. Any thoughts?
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Old 07-27-2004, 07:35 PM
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Seems like the fan motor running backwards [counterclockwise] has got the wiring/connecters/switches/ or relays are accidently cross polarized...

Meaning that something is hooked to the positive circuit, when it needs hooked to the negative/earth/ground circuit...

Just trying to help, thanks.
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Old 07-27-2004, 08:25 PM
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I'm not familiar with your particular application, but it seems to me that the only important consideration is which direction the air is blowing. If it's pulling air in from the front and blowing it out the back through the radiator that's all that really counts. Could be that they've changed suppliers and the new guys make their fan blades bent the other way. Doesn't really matter which way it turns as long as it's blowing air in the right direction.
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Old 08-01-2004, 09:58 AM
DHA DHA is offline
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Following the advice given here, I reversed the terminals/polarity and found that the direction of rotation reverted back to "Clockwise" just as one would expect. I'm still puzzled how the wires got reversed, oh well.

Perhaps someone out there can explain why the selling price of the left fan (drivers side) is more than the expensive than the right fan, regardless of supplier. they look like mirror images of one another, use only two wires so there isn't an issue of one operating while the other idles. Are the fans different?
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