Re: Radiator and fan removal and replacement advice - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Re: Radiator and fan removal and replacement advice
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Posted by John Lewis [Email] (more from John Lewis) on Fri, 23 Dec 2022 14:04:37 Share Post by Email
In Reply to: Re: Radiator and fan removal and replacement advice, John Lewis, Sat, 15 Aug 2020 09:57:33
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A couple of years ago the fan resistor fried itself on my 1996 900 turbo and I couldn’t find a replacement. There was a suggestion for the resistance needed, but it seemed way too high. I calculated what I thought would cut the fan speed in half (cutting the voltage from around 12 volts to 6). I figured the power the fan used would go down with the cube of the speed reduction. Putting that together indicated a resistor of about 1.4 ohms. And I ended up buying a 1.5 ohm 50 watt resistor Rierdon 696-1466-ND from Digi-Key I think. Putting that in got me about 4 volts on the fan instead my goal of 6 volts, but I figured that was close enough. I didn’t mention this at the time because I wanted to make sure things would go okay over time. And they have.

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