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Old 11-12-2017, 03:43 PM   #1
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Low Speed Fan Resistor Alternative

So right side radiator fan wasn't running the other day as the left side kicked on. Didn't work turning AC on, so I jumped the low speed relay (#21 for right side low - Bentley's has a typo for this) and it still did not operate. I jumped the high speed (#22 for right side high) and the fan worked so it must be the low speed Resistor.
$120 to replace just the resistor and no aftermarket - Are You Kidding me.
$150 to replace the fan with resistor, now that actually seems reasonable.
I'm so cheap so!!!
There are articles on buying an air cooled resistor (.5 Ohm, 100 watt) - $9.95
So I bought (2) for when the left side goes out or I screw up
I was going to have to splice the (3) wires (All Green, Green White strip, All White) If I bought the Porsche resistor so this work was the same
Mounting was the question. There is a metal tab at the back of the chamber where the fan was. I had to simply drill a hole through the plastic, it was at the perfect spot to mount one corner.
I used #8 1-1/4 stainless steel bolts, nylon locking nuts (2/bolt) and plastic wire hangers.


Wiring - All Green wire goes to ones side
- Green/White strip wire and All White wire both connect to the other side
I did not soldier. I used crimp fittings and heat shrink tubing. I may pay for that with time.


I mounted and used a backer for the other hole. I had the inner fender off so I could get to this area easily.


And the final product from the front
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Last edited by kk2002s; 11-12-2017 at 03:46 PM.
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Old 11-12-2017, 06:35 PM   #2
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Nice writeup!
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Old 11-17-2017, 07:49 PM   #3
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Did the same fix, very cost effective and so far dependable through the summer after 5,000 miles. If I recall, I used 50w registers slightly below 0.5ohm, and the original clamp could wrap it around just like factory install, after cutting off the mount ears.

Also added a toggle switch to manually turn on/ off the fan, so I got full control to keep the engine cool consistently in heavy traffic during summer, plus easy to diagnosis for bad fan/ register with a flip of the switch.
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Old 11-18-2017, 10:52 AM   #4
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If you are concerned about summer heat in slow /no-go traffic. suggest the simple mod of relocating the Temp sensor for the engine compartment purge fan.If you reposition it closer to the cylinder head , it will turn on the exhaust fan sooner/longer.
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Also added a toggle switch to manually turn on/ off the fan, so I got full control to keep the engine cool consistently in heavy traffic during summer, plus easy to diagnosis for bad fan/ register with a flip of the switch.
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Old 06-11-2018, 09:57 AM   #5
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Ready to install resistor

I'm about to install a replacement resistor for rad fan.
Is 100w 1 ohm resistor ok?

Currently not running,at least one lead is corroded off the original.

Can't justify $150 for a $5 resistor

Thx in advance
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Old 06-12-2018, 01:29 AM   #6
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The original resistor is about 0.5 ohm. If you have a couple of 1 ohm resistors, put them in parallel and you will be fine.

I replaced mine with a single 0.5 ohm (0.5R) 100W resistor about 6 months ago and it has been working fine ever since.
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Old 06-12-2018, 03:29 AM   #7
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Thanks!

I ordered two, so I'll parallel them. Hope to have them tomorrow. Makes me nervous not having them working, especially with weather in the 90's! (Central Florida).

Thx Again!
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Old 06-12-2018, 06:33 AM   #8
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So the product I used was that Arcol HS 100 R5 J as pictured. it is .5 Ohm therefore I only used 1
The fan works as expected for low speed
I did buy 2 so I was ready for the other fan's low speed to die at some point.
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Old 06-12-2018, 03:28 PM   #9
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Installed in parallel, pretty easy.
Did not even have to pull the wheel.

I'll post some pics tomorrow

Working as expected
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Old 07-24-2018, 06:32 AM   #10
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