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Old 02-27-2007, 09:09 PM   #1 (permalink)
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Molex pin question

Hi. I have a fan that absolutely cannot be reversed physically. It is stuck where it is for life in the case.

Can I pull out the red and black wires/pins, and reinsert them in opposite holes to reverse the fan's rotation?

Last edited by Steven_Spinosa; 02-27-2007 at 10:50 PM.
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Old 02-28-2007, 07:36 AM   #2 (permalink)
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standard pc fan? should be reversible, but thats the fun part of molex is that it's one way to connect and thats it. Any particular reason why you want it reversed?
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Old 02-28-2007, 01:41 PM   #3 (permalink)
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OKay, sometimes it works and sometimes it doesn't. That's been my experience. I don't think the fan will blow up if you try it though.

By the way, the big 4 pin white plastic power connectors that everyone calls Molex connectors aren't manufactured by Molex. You won't find them in the Molex catalog. I know they're made by someone else but I can't remember who.
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Last edited by Jaan; 02-28-2007 at 01:47 PM. Reason: I remembered something...
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Old 02-28-2007, 01:53 PM   #4 (permalink)
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Even if it runs you may not get adequate performance out of the fan. Look at the blades. Are they concave? It's not going to push air very effectively in the opposite direction if they are.

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Old 02-28-2007, 01:58 PM   #5 (permalink)
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Nuts. I'll check. Thanks for helping!

It is one of these guys. hxxp://www.frozencpu.com/products/3687/slf-07/Motherboard_Cooler_Slot_Fan_ST-900.html

You now see the problem. It can't have the flow reversed by flipping it, like any other fan. It's a weird critter, and I wanted to use it as an intake. That would put more air right in front of the fins of my CPU cooler's heatpipe tower.

As it stands, it is a forward-exuast type. It would just be fighting with my lower 120mm fan (also an intake). The blades do look curved.


-seperate idea-
Meh. I should just use some sheet metal and get creative with some 40mm fans I have. Use two 3.5" bays and put the 40's side-by-side and duct the flow right into my cooler's fins.

Last edited by Steven_Spinosa; 02-28-2007 at 02:12 PM.
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Old 02-28-2007, 09:15 PM   #6 (permalink)
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Depends if its impeadence protected or not (IIRC that the correct term) You can get a tool to pull the molex pins in and out.
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Old 03-01-2007, 11:36 AM   #7 (permalink)
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Even if it runs you may not get adequate performance out of the fan. Look at the blades. Are they concave? It's not going to push air very effectively in the opposite direction if they are.
In this respect, cheaper fans work better reversed.

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You can get a tool to pull the molex pins in and out.
That tool is expensive, relatively speaking. You can get away with just pushing in the tabs on the side of the pins with a small screwdriver, and then pushing them back out before reinsertion.
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Old 03-01-2007, 12:06 PM   #8 (permalink)
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yeah there's a tool for it, but a small screwdriver tends to work better IMO. sometimes the tabs set really well and its a royal PITA to remove them without destroying them.
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