How do I direct wire the radiator fan? - Mercedes-Benz Forum
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post #1 of 13 (permalink) Old 02-26-2011, 07:13 PM Thread Starter
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How do I direct wire the radiator fan?

I've got an 2003 s600 that I'd like to be able to turn the radiator fan on and off at will. I like to turn it on when I'm in the staging lanes at the dragstrip. Is there a way to bypass the fan control module? There are 4 black wires going from the fan control module to the fan motor itself? Does anyone have a schematic of what each of these 4 wires does?
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post #2 of 13 (permalink) Old 02-27-2011, 04:57 AM
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Originally Posted by Silverstallion View Post
I've got an 2003 s600 that I'd like to be able to turn the radiator fan on and off at will. I like to turn it on when I'm in the staging lanes at the dragstrip. Is there a way to bypass the fan control module? There are 4 black wires going from the fan control module to the fan motor itself? Does anyone have a schematic of what each of these 4 wires does?
you said it yourself, its a control module that controls the fan, so even if you will disconnect the supply to it- you will only be able to switch it off. But its not up to yo then to switch it on at the moment. The controller switching it on. unless you want to cut it all off and have simple positive negative to it. Doesnt make sense to me, but if thats what you wanna do...
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post #3 of 13 (permalink) Old 02-27-2011, 07:01 AM
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Unless you use the car on the track exclusively, I can't even imagine why you would want to bypass the fan. The first time you get stuck in a Summer traffic jam, you have other things on your mind, and you forget to "flip the switch". Doesn't take long for an overheat to destroy an engine...

Have you put the car on a Dyno to see how much BHP you are actually losing when the fan kicks on? With an electric fan, it should be absolutely minimal...
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post #4 of 13 (permalink) Old 05-11-2019, 02:20 PM
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I have a Mercedes-Benz A0999063902 Rad Fan and I am trying to wire in but not having any luck. It has 4pin wire coming out of motor 2 10 gauge and 2 16 gauge wire and it is variable speed. trying to wire it in to 54 pickup. Please HELP me.
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post #5 of 13 (permalink) Old 05-12-2019, 09:47 PM
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It shouldnt be hard to find out on your own.
I understand why you would want that baby on high
right on the ling when your staging.
What I would do is just probe it when its hot or force it on
like turning on the A/C and find out which one lights it up and just set up a different
wiring hooked up to a switch inside somewhere with the plug unplugged so when ur at
the strip next time you can force it on

Or it might just be throwing grounds from the coolant temp switch or lowering or rising resistance from cold to hot and that might be the slick way to
power it up on the line
I know its thrown on with the reading from the coolant switch thu the engine control module
I think from the one on the back of the cyl head
Ill look into it and let ya know a little later on if no one tell ya a simple way to hot wire/override ur fan

And tell me whats ur 60 foot times and ET's and MPH ??????

and ya have a videos you care to share????
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post #6 of 13 (permalink) Old 05-12-2019, 09:56 PM
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Wait let me look up a cooling fan relay and coolant temp switch
It would be easier to bypass a relay. Let me see and Ill get back to ya
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post #7 of 13 (permalink) Old 05-12-2019, 11:55 PM
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W220 Cooling Fan Controller is Hard Wired to Permanent + and -

It receives a PWM Signal from ME ECU and as the Pulse Width varies based upon Engine Temp Data so the Fan Speed varies.

Why anyone would want to mess with it is beyond me, and if your looking to install this Fan in something other than a W220 then there are far better aftermarket alternatives available.


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post #8 of 13 (permalink) Old 05-13-2019, 01:03 AM
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Sounds like he is trying to install it in a 1954 pickup . Probably got it cheap at the junkyard .
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post #9 of 13 (permalink) Old 05-13-2019, 03:03 AM
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Just needs a regular Car type 12V Fan and a Relay, I'd also use a Thermostatic Switch that fits in the Cooling System, less chance of forgetting to switch it on then


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post #10 of 13 (permalink) Old 05-13-2019, 05:01 AM
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Come on Everyone Dont Bash em because you have never been at the Strip
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