loud fan sound comes just after ignition on
Thread Starter
Junior Member
Joined: Mar 2015
Posts: 15
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From: Poland
w215 cl600 2001
loud fan sound comes just after ignition on
Excuse me but i have c215 cl600 just for 3 weeks 
but i wonder
what gives such audible sound after ignition on
its like some kind of ventilator
It comes from passenger side, near (under) headlamp
is it normal?
I think i hear it everytime, even engine is running
but i wonder
what gives such audible sound after ignition on
its like some kind of ventilator
It comes from passenger side, near (under) headlamp
is it normal?
I think i hear it everytime, even engine is running
Thread Starter
Junior Member
Joined: Mar 2015
Posts: 15
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From: Poland
w215 cl600 2001
I thought so. Thanks for answer
The only problem is that this pump wont stop after minute or two
sometimes it sounds like hairdryer even when engine is hot.
I hear it almost everytime.
I know about well known issue with relay and air pump
so i bought cheap china replacement for less than $200
and i'm waiting for it
but please tell me, Does it start after ignition on, even when engine is hot?
The only problem is that this pump wont stop after minute or two
sometimes it sounds like hairdryer even when engine is hot.
I hear it almost everytime.
I know about well known issue with relay and air pump
so i bought cheap china replacement for less than $200
and i'm waiting for it
but please tell me, Does it start after ignition on, even when engine is hot?
Thread Starter
Junior Member
Joined: Mar 2015
Posts: 15
Likes: 0
From: Poland
w215 cl600 2001
my pump starts every time after ignition on, and gives engine check very often
so it needs to be replaced for sure
Last edited by Martin78; Mar 22, 2015 at 07:57 AM.
MBWorld Fanatic!
Joined: Jan 2008
Posts: 6,150
Likes: 533
Mercedes
Anyway back to the main topic of this thread , the fan coming on high is a classic symptom of a bad SAM or ecu due to water damage so you must fix the water damaged parts before replacing the SAM or ecu unless you want to immediately fry the new one you put in.
Last edited by tusabes; Mar 23, 2015 at 12:23 AM.
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Thread Starter
Junior Member
Joined: Mar 2015
Posts: 15
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From: Poland
w215 cl600 2001
I removed air pump realay. Nothing changed. Then i plug new original relay. Still hear this fan sound. Air pump dont vibrate when i'm touching it. Sound comes not from this pump but from under the headlamp all the time after ignition on. Computer gives no errors.
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Thread Starter
Junior Member
Joined: Mar 2015
Posts: 15
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From: Poland
w215 cl600 2001
My mechanic can't help also,
he don't know what cause this hum after ignition on
but definitely this is not an air pump
he claims that this is abc cooling system and something is wrong with that, but he don't know what (no errors)
but after some research i don't see any special ABC fan in my car
I know that common issue with abc is pulsation dampener failure
which gives hum sound from passenger side, but the main question is
Is it possible that abc pulsation dampener gives fan type sound even when engine is off?
when i just turn ignition on?
(i don't have any visible abc issues)
update: after more research i probably found the reason
my auto is equipped with webasto heater
and it has own fan which i hear
its located under the right lamp, near bumber
bingo
but i must find out why its running even when engine is hot
and how can i turn it off
maybe one of temperature sensors is faulty
he don't know what cause this hum after ignition on
but definitely this is not an air pump
he claims that this is abc cooling system and something is wrong with that, but he don't know what (no errors)
but after some research i don't see any special ABC fan in my car
I know that common issue with abc is pulsation dampener failure
which gives hum sound from passenger side, but the main question is
Is it possible that abc pulsation dampener gives fan type sound even when engine is off?
when i just turn ignition on?
(i don't have any visible abc issues)
update: after more research i probably found the reason
my auto is equipped with webasto heater
and it has own fan which i hear
its located under the right lamp, near bumber
bingo
but i must find out why its running even when engine is hot
and how can i turn it off
maybe one of temperature sensors is faulty
Last edited by Martin78; Apr 15, 2015 at 04:01 AM.
Thread Starter
Junior Member
Joined: Mar 2015
Posts: 15
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From: Poland
w215 cl600 2001
no, its not main radiator fan
but i found something like this
http://www.mbpartsworld.com/showAsse...rimLevel=20530
additional radiator and additional fan blower
650, 670
on the right side...
i'm confused
anyone can tell me, what is purpose of this additional fan blower in my car???
and what is the reason it's running all the time?
but i found something like this
http://www.mbpartsworld.com/showAsse...rimLevel=20530
additional radiator and additional fan blower
650, 670
on the right side...
i'm confused
anyone can tell me, what is purpose of this additional fan blower in my car???
and what is the reason it's running all the time?
Last edited by Martin78; Apr 26, 2015 at 07:02 PM.
MBWorld Fanatic!
Joined: Jan 2008
Posts: 6,150
Likes: 533
Mercedes
That noise is a fan. It's not an air pump or webasto heater . If you say it's not the main fan then it's the aux fan, and as I said several posts up, when a fan comes on high speed and will not shut off it is usually due to damaged ecu
Thread Starter
Junior Member
Joined: Mar 2015
Posts: 15
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From: Poland
w215 cl600 2001
This part is additional fan ecu?
http://www.aliexpress.com/item/02754...418246892.html
http://www.aliexpress.com/item/02754...418246892.html
Thread Starter
Junior Member
Joined: Mar 2015
Posts: 15
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From: Poland
w215 cl600 2001
small update
on cl600 m137 there is no additional fan ecu!
i bought this part, but my mechanic told me that only amg cl55 or cl500 have additional ecu module
I had faulty temperature switch, very cheap
relay was good, fan was good
on cl600 m137 there is no additional fan ecu!
i bought this part, but my mechanic told me that only amg cl55 or cl500 have additional ecu module
I had faulty temperature switch, very cheap
relay was good, fan was good
