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rad fan always on when running....?

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Old 06-29-2021, 11:42 PM
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mercedes 71 280sl. Porsche 930 . Ducati mh900 and ps1000
rad fan always on when running....?
Hi guys , have not driven the car in a while and noticed the radiator fan is always on with the engine running , is this normal?
it does not run on high but I really hear it running.
I think the fan is now noisy .
car is a 2013
thank you
Erick
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Old 07-01-2021, 06:07 PM
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faulty fan controller,faulty SAM and or coolant temp sensor----which one-----thats why we have diagnostic equipment and folks that know how to bla bla
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Old 07-01-2021, 08:35 PM
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mercedes 71 280sl. Porsche 930 . Ducati mh900 and ps1000
thanks Pluto ,
so I guess the answer is that it should not run when cold?
BTW I have Xentry and no code . thanks for the helpful answer
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Old 07-02-2021, 02:32 AM
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2013 W204 C63 AMG P31 Estate wagon
Can't answer about my C63 but my old car had climate control (like my c63) and fan was on slow speed all the time while climate control was switched on.
If you turned the AC off then the fan would stop.
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Old 07-02-2021, 09:51 AM
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mercedes 71 280sl. Porsche 930 . Ducati mh900 and ps1000
Can anyone check please this morning if fan should run low with climate control off ?
thanks
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Old 07-02-2021, 10:51 PM
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is it tuned?
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Old 07-03-2021, 01:00 PM
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mercedes 71 280sl. Porsche 930 . Ducati mh900 and ps1000
Originally Posted by roadtalontsi
is it tuned?
yes V7
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Old 07-03-2021, 06:01 PM
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Perhaps "Desert Mode" was turned ON allowing the fan to run earlier at lower speeds.
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Old 07-04-2021, 04:00 AM
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12' W204 C63 AMG coupe "T-Rex", 12' W451 Smart Fortwo Pulse (99' W202 C43 AMG sold)
Originally Posted by Solo wing
Perhaps "Desert Mode" was turned ON allowing the fan to run earlier at lower speeds.
Does that really exist?
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Old 07-04-2021, 05:51 AM
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Originally Posted by DRBC43AMG
Does that really exist?
Yes. The fan can be coded to just run constant as well.
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Old 07-04-2021, 05:56 AM
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double post
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Old 07-07-2021, 01:01 PM
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make sure there's no air in your cooling system as well.
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