Diagnosing Mercedes cooling fan stays on

Diagnosing Mercedes c350 cooling fan stays on all the time, found defective engine control unit, but it could be any of these, temperature sensors, engine cooling fan, engine control unit , front fuse box, defective relay, A/C control unit, etc
Always have a proper diagnosis!

[@MilkyWayGalaxyKid]

Good stuff bro

[@anassbenchaou2876]

I had the same problem with the c200 2.0L, but i solved the problem with 0$ cost. i just cleaned the AC temperature sensor it was dirty, and it was giving the wrong signal to the ECU

[@kerimumichael3788]

I have same problem but the temperature gauge does not move up even when engine his on and fan really blowing on high speed

[@DeshiBaba-xz5tj]

Vito w447 only see it running when Ac is on other wise don’t run . Any advice will be greatly appreciated. Thank you

[@ShaunPillay-h1u]

I have the same problem on my W204 c180k 2009 model what can be the problem

[@alexc8901]

What’s the cost total?

[@dtdmohamad2843]

I have the 2013 c350 model i have the same issue but my engine is differnt i have the new black engine v6 the ecu come on the side of the engine not on the top of it

[@AlexAlex-cs8bi]

Hi
Did you solve the problem?

[@santana095]

I have the same problem i have 3.5 engine