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Cooling fan running on high on cold start

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S-Class (W220) 1999-2006: S 320 CDI, S 320, S430, S 500, S 600

Cooling fan running on high on cold start

 
Old 04-20-2016, 09:13 AM
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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 04-20-2016, 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 04-20-2016, 04:36 PM
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I would not consider either condition to be normal on a W220.
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Old 04-20-2016, 04:56 PM
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Is the defroster on? That would engage the AC compressor and fan.
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Old 04-20-2016, 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 04-22-2016, 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 04-22-2016, 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 04-23-2016, 01:35 AM
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2003 S430, 2014 E350
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 05-08-2016, 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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