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Cooling fan running on high on cold start

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Old Apr 20, 2016 | 09:13 AM
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S500
Cooling fan running on high on cold start
I have a 2004 s500 and the cooling fon is running on high on a cold start also the outside temp is irratic . The car is driving normal and the temp gauge is normal . Anyone have any idea ,it could help me . I am new to this forum ,first time user
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Old Apr 20, 2016 | 11:14 AM
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You want to be on the W 220 board, but both conditions are normal for a 220.
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Old Apr 20, 2016 | 04:36 PM
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I would not consider either condition to be normal on a W220.
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Old Apr 20, 2016 | 04:56 PM
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Is the defroster on? That would engage the AC compressor and fan.
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Old Apr 20, 2016 | 07:43 PM
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The most common cause of cooling fan running on high is a damaged ECU, usually from water. Had it rained recently in your area?
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Old Apr 22, 2016 | 01:47 PM
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Thanks for all the answers . No I don't have in defrost mode . And I know it is not a normal operation . I am going to a garage to run as an on it ,hopefully this will lead me the source of the problem
Thanks
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Old Apr 22, 2016 | 01:53 PM
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There was some rain and I took the Ecu apart and clean it . Ther is one other issue that I did not mention on my previous post . The air condition goes to economy mode even and it is showing a low pressure code (1241 ) after driving for a little while . The out side temp reading is not correct when all this is going on
Thanks for all the help
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Old Apr 23, 2016 | 01:35 AM
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There are only a few ways the cooling fan will run at a high rpm.

1) MAX Cool. from the A/C
2) Bad ECU, however this is usually not the case, because the car probably won't start with a bad ECU.
3) A temp sensor, Oil, Coolant, A/C is malfunctioning. Although it may say Normal for the Coolant, maybe another sensor has failed and triggered the fan to spin at a high rpm.

Does the fan return to normal after the engine warms up?
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Old May 8, 2016 | 11:46 AM
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When the car reach normal condition the fan operate normal . Also understand cold or rain the problem is more apprant . The ac will shutdown with 1241 as a code (low freon pressure ) . With gauge hook up to the ac system the pressure is Normal.
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Old Jan 3, 2024 | 12:35 PM
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fan running when engine is cold. reasons and fix. Read Here
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Old Jan 3, 2024 | 06:45 PM
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Originally Posted by travor121
fan running when engine is cold. reasons and fix. Read Here
OK, first, you're resurrecting a thread that is eight years old. Next, the link you provide is not helpful. The cooling fan will go to high to cool the condenser - it is normal. Your link suggests a set of problems, but there are times when this is normal.
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