W203 won't start, loud fan only
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Joined: Dec 2025
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Mercedes C200 Kompressor 2001
W203 won't start, loud fan only
Hello everyone, I'm Alex from Serbia. I'm kinda stuck with my car it had some problems cranking for a few days but now it won't even do that all i get is a loud fan on 2nd position and 3rd doesn't do anything. I have checked the fuses and relays they all work as far as i know, but I've come to a problem where my obd2 scanner won't connect anymore to the car. I can share more info just ask, but I can't take it to a service because it's not cranking and I can't read any codes. So any opinions are welcome. Thanks
Thread Starter
Newbie
Joined: Dec 2025
Posts: 5
Likes: 1
Mercedes C200 Kompressor 2001
Thread Starter
Newbie
Joined: Dec 2025
Posts: 5
Likes: 1
Mercedes C200 Kompressor 2001
I don't know how to check that, but i checked and opened the connections and ECU board, it does have some white residue i cleaned it but it's still the same. Still can't read my OBD2 connection with the car. I'm thinking it might be the ecm
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Newbie
Joined: Dec 2025
Posts: 5
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Mercedes C200 Kompressor 2001
White residue-powder, any idea what this means?
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MBWorld Fanatic!
Joined: Jun 2002
Posts: 7,265
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From: So. Oregon Coast
C230 Sport Coup + 2006 W164 ML350 + 99 Ford Escort RIP
I had that problem. My 262K mile C230 leaks. Always has. Water gets in, and really mucks things up.
I got liucky. Once it dried out, it was ok.
Parked in a big storm recently?
I got liucky. Once it dried out, it was ok.
Parked in a big storm recently?
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Super Member
Joined: Oct 2012
Posts: 538
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From: Hollywood, CA
W209, W124
Remove from car and lightly brush using toothbrush and white vinegar.
Rinse with high % alcohol. Fan dry or sun dry for a few hours. If still dead you will need to replace/clone. Hopefully they can pull info.
Rinse with high % alcohol. Fan dry or sun dry for a few hours. If still dead you will need to replace/clone. Hopefully they can pull info.
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Newbie
Joined: Dec 2025
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Mercedes C200 Kompressor 2001
Fixed
Thanks everyone for trying to help, I ended up finding the problem myself. We had to remove the whole fuse box in the front (under the hood) and open it. Soldering is bad on older models and when a friend of mine checked it under microscope the soldering was cracked and didn't get contact so we resoldered everything and reconnected again. Everything is good now, it was not the ECU! Saved a couple of $$, hope this helps someone in the future
