07-02-2015, 11:07 PM | #1 |
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Join Date: Sep 2011
Location: Golden Valley,MN
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Fan speed
Hey all,
I'm using a Mercedes Benz electric cooling fan on my 51, S-10 swap. I've got a 327 SBC for power. The fan is on a thermostat type switch, on at 185 degrees off at 180. My trucks runs at about 185-190 degrees most of the time so the fan runs most of the time. It works great, but it is loud. I'm thinking about putting a resistor in line to the fan motor to slow it down and hopefully quiet it down. I'm electronically challenged, what type/ size resistor do I need. How many OHMS/ WATTS etc. Thanks for any help!
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07-03-2015, 10:06 AM | #2 |
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Join Date: Mar 2012
Location: Lakes Region NH
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Re: Fan speed
The inline resistors that GM used to use were large, ceramic pieces likely good for 10-20 watts IIRC. Aftermarket fans are in the 200-350 Watt range so you'll probably need a stout part. You can look at a Dorman 902-219 which is a fan resistor and wiring pigtail for a 2010-ish Focus. It's designed to bolt to the fan shroud so air moves across the resistor.
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07-04-2015, 11:42 AM | #3 |
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Join Date: Sep 2011
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Re: Fan speed
Thanks, I'll check that out.
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07-08-2015, 02:05 PM | #4 |
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Join Date: May 2013
Location: Kansas City
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Re: Fan speed
If you put a resistor in-line with the fan power supply you'll always be limiting the fan. You may get a hot day in traffic where you regret it.
I would either get a new thermostatic switch with a higher on / off. Or, I'm thinking of running a pulse width fan controller such as: http://derale.com/products/electric-...n-probe-detail https://www.flex-a-lite.com/accessor...ontroller.html Derale, Flexalite, Spal and some others make them. |
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