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Fan runs constantly

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Old Dec 23, 2017 | 12:08 PM
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4matic57703
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C280 4matic
Fan runs constantly
hello all, I am in dire need of help! My cooling system fan started running on high yesterday with the temps hovering at a balmy +10 F degrees yesterday. I have a couple questions....

1. Is it safe to drive like that?

2. What are the potential causes?

3. Quick fix suggestions as my closest dealer is 6 hours away.


It is a 2007 C280 4matic

appreciate the assurance and hope all have a great holiday
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Old Dec 11, 2019 | 09:34 PM
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2007 c280
I have the same car and mine started doing the same thing today. I came home in my truck and the fan in my c280 was running. I started the engine and the fan quit. The fan started running again when I cut off the engine. The fan ran until the battery died. I hooked up the battery charger and the fan started running again. Need help
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Old Dec 12, 2019 | 11:01 AM
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bone stock E55 AMG
moved to W203 forum...
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Old Dec 12, 2019 | 11:53 AM
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C320
Fan runs as a fail safe when it loses communication with the ECU. You have canbus issue.
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Old Dec 13, 2019 | 08:51 AM
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It can also be a problem with the temperature sensor on the M272 engine:

http://benzbits.com/M272/CoolantTempSensor.pdf
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Old Dec 13, 2019 | 11:02 AM
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Originally Posted by Rudeney
It can also be a problem with the temperature sensor on the M272 engine:

http://benzbits.com/M272/CoolantTempSensor.pdf
Not in this situation. If the sensor was bad fan would still be running when he starts the engine.
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Old Dec 15, 2019 | 05:21 AM
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Mercedes-Benz C200 Kompressor 2003 Year M271 Engine
Check fuse (51) under the hood for the coolant blowing motor, change it and start the car again to see if this was your problem with the fan.
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Old Dec 15, 2019 | 02:31 PM
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Originally Posted by tjts1
Not in this situation. If the sensor was bad fan would still be running when he starts the engine.
Th OP said his runs on high all the time. The 2nd poster said his shuts off (or slows) when the engine is started.
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Old Jan 26, 2020 | 03:22 PM
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C230 COUPE 2003 M271
Im not sure if you can test this or not but if you can:

can you test if your AC will work or any sign of working? I know when my AC Condensor (in front of radiator) temp/pressure sensor was unplugged the fan would run on high regardless of anything. If your ac works still in any capacity, you can eliminate that. I am assuming your engine coolant temperature is checked already and accurate also?

You don't necessarily need to go to a dealer. If you have a scan tool or go to any mechanic in town they should be able to diagnose this pretty quickly
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Old Jan 26, 2020 | 08:24 PM
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2007 c280
Fan
Mine did the same thing. I disconnected the battery and charged it fully. When I connected it everything worked.
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