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Cooling fan on constantly? Help

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Old Jun 19, 2023 | 06:58 AM
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HBuick's Avatar
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E350
Cooling fan on constantly? Help

Hello there

first post on the forum so bare with me,

I have a E3250 and just as of this weekend when I start it up the cooling fan fires up very high very loud and does not turn off!

Anyone any ideas what has caused this and how I fix it? Driving me mental and I’ve also noticed the air con is now basically like Luke warm water however I don’t know if that’s connected or if my air con just needs topping up

Any advice would be great because I haven’t a clue

thanks

Harry
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Old Jun 19, 2023 | 09:35 AM
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2014 E63S; AMS 100 octane ECU dyno tune; EDOK TCU tune; BB intakes; sprintbooster
Originally Posted by HBuick
Hello there

first post on the forum so bare with me,

I have a E3250 and just as of this weekend when I start it up the cooling fan fires up very high very loud and does not turn off!

Anyone any ideas what has caused this and how I fix it? Driving me mental and I’ve also noticed the air con is now basically like Luke warm water however I don’t know if that’s connected or if my air con just needs topping up

Any advice would be great because I haven’t a clue

thanks

Harry
https://mbworld.org/forums/e-class-w...-fan-high.html

https://mbworld.org/forums/e-class-w...-fan-high.html
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Old Jun 19, 2023 | 11:05 AM
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E350

thank you for this
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Old Jun 21, 2023 | 03:54 PM
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Okay so I’m still really struggling with this does anyone have any ideas? I’ve tried the things the previous user linked me too and nothing has worked

I start the car the fan goes upto high speed and stays there

thats with air con on and off..

with air con on though I must add it doesn’t work atall like it’s just normal air coming through not air conditioned
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Old Jun 22, 2023 | 09:03 AM
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04 E55 AMG (totaled), 07 S550 4Matic, 14 E63S
In my iCarSoft, I found a menu called "reasons for A/C disable." You could poke around in there for clues. A full scan should also reveal numerous clues...
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