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Discussion Starter · #1 ·
Greetings,
I'm new & joined here to get some info for a non-MB project. I am looking to buy a radiator cooling fan for severe duty use, and in my research I found that Mercedes appears to have used 600 and 850 watt fans for use on the W220 cars among others.

What I'm looking for is a junkyard spotter's guide of sorts as to what years and models have which fan, and if the fan is loose how to confirm it is one or the other. I'm looking to avoid the belt-driven fans. I'm interested in the ones that have the 6-wire controller: 4 large wires and two small wires. As I understand the wiring, one of the small wires is a PWM signal while the other is an ignition signal. From what I have read, it appears there is an order to when each of these sends a signal to the fan controller.

Any advice or education here is appreciated!
 

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3 Posts
Discussion Starter · #3 ·
Thanks for the reply. Pin 3 is just straight 12V ignition according to that diagram. That will make things much easier. This Megasquirt thread alluded to the ignition having to be delayed until the PWM was output:

I also need to figure out some logic to ensure that the ignition trigger wire only gets power after the PWM signal is sent otherwise the fan fail safes full blast if it gets ignition first and PWM after. It won't operate until power cycled on ign trigger with PWM first.
Also a massive 150A fuse!
 

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2000 S430, 2000 S500, 2003 S600 TT, 2005 E320 CDI, 2006 S500 4Matic, and 2006 S350
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Welcome to BenzWorld!

Please take a moment to update your user profile with the following information.

1.) Specific model, and model year, of your Mercedes-Benz
2.) Whether or not it's a 4matic
3.) Your general location in the world

We ask for this because MB made certain options available only on certain models, during certain years, in certain countries, and we do have an international profile. So, this information really is needed in order to properly advise you. "But why not just put that info in my post?" Sure, people do that, but threads can get long, and people won't always scroll through the entire thread just to get your model and year of car. Putting in the profile makes it much easier on us, the members, to see which model/year/country we're talking about. It's also simply considered, "good manners" around here.

With all that said, I think you'll find our community of Mercedes-Benz owners to be a pretty fun lot, as many of us, myself included, do our own maintenance and do what we can to help each other out.

Again, welcome!
 
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