Fan always on M271

narnia999

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Your Mercedes
W203 C200 Kompressor 2003
Hello, i’m new to the forums but have been lurking for a while. I have C200 kompressor 2003 with cooling fan always on full blast. i don’t have AC gas, AC rest button is lit, heating works. I have changed the thermostat and coolant as it was another issue, now engine temp sits around 90 just like it should be, but fan is always on and it’s very noisy. I have tried with different heating temperatures in relation to ambient temp but always same result. There was this one time when after turning engine on, fan just didn’t kick in at all with no errors as well. After this, it kept doing the same stuff. Also, there was a episode where i’ve been travelling 50 miles one way to work for a week, fan seemed to work just like it should be - off on motorways, turned on soon as stopped in traffic. Now, it’s just continuously on, i removed fuse 54 just for test drive(read as peace of mind) and it was all good, temp sits at 90 regardless the visit the workshop message. can i drive like that until i fix the problem? i can’t get codes readed atm and looking for any advices or similar experiences. Thanks!
 

Snake Charmer

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Your Mercedes
S211 E320 CDI 2004
You need to read the codes, I'm not certain but think low aircon gas pressure causes the fan to run constantly. Have you tried turning the aircon off?
 
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narnia999

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W203 C200 Kompressor 2003
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You need to read the codes, I'm not certain but think low aircon gas pressure causes the fan to run constantly. Have you tried turning the aircon off?
It’s constantly off, the AC rest button is always lit and i tried it with all the possible heating and cooling settings. I won’t be able to check codes until next week but will update once i get them. Do you think it’s safe to drive without fuse 54 for those couple days?
 

Snake Charmer

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When you say cooling fan, do you mean the engine cooling fan?
 

Snake Charmer

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S211 E320 CDI 2004
Yes, big engine fan in front of the car. my wording might not have been precise
Just making sure, I would not drive the car with the fan not running correctly but would with it running constantly.
 

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