2017 C coupe making high pitch sound after parked for 30 minutes
Thread Starter
Junior Member
Joined: Mar 2016
Posts: 23
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From: Manhattan Beach
S550 E350 C300c
2017 C coupe making high pitch sound after parked for 30 minutes
Our 2017 C300 coupe sometimes will make a siren sound after parked in the garage for 30~40 minutes, it'll stop after a minutes or so. There're no other devises in the garage or anything nearby would make such sound.
Happened (or got caught) 4 times already, went to the dealer, hooked up to computer and no fault code.
Finally caught it on video twice in the garage, I don't know if you can hear it clearly but this is what it sounded like:
Anyone ever heard of such a sound? TIA.
Happened (or got caught) 4 times already, went to the dealer, hooked up to computer and no fault code.
Finally caught it on video twice in the garage, I don't know if you can hear it clearly but this is what it sounded like:
Anyone ever heard of such a sound? TIA.
Thread Starter
Junior Member
Joined: Mar 2016
Posts: 23
Likes: 1
From: Manhattan Beach
S550 E350 C300c
Thank you for your reply.
I'm not sure what kind of headlight it has, my wife lost the original window sticker.
Do you think the LED headlight has something to do with it?
I'm not sure what kind of headlight it has, my wife lost the original window sticker.
Do you think the LED headlight has something to do with it?
Last edited by StephenW2016; Apr 18, 2018 at 02:21 AM.
Thread Starter
Junior Member
Joined: Mar 2016
Posts: 23
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From: Manhattan Beach
S550 E350 C300c
MBWorld Fanatic!
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From: Miami, FL
2003 CL 600
Yes, the LED lights have fans in them that can run up to an hour after to control temperatures. There have been instances of it being reported like this, so it may very well be normal.
Thread Starter
Junior Member
Joined: Mar 2016
Posts: 23
Likes: 1
From: Manhattan Beach
S550 E350 C300c
Thank you so much for your help, I just found out this coupe has LED headlight.
I'll go check with my service adviser if he knew anything about it.
Best regards.
I'll go check with my service adviser if he knew anything about it.
Best regards.
Thread Starter
Junior Member
Joined: Mar 2016
Posts: 23
Likes: 1
From: Manhattan Beach
S550 E350 C300c
Will the fan start to work 30 minutes after engine off? Because all 4 times we caught it were about 30~40 minutes after car parked. And all happened in daytime. Thank you very much.
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MBWorld Fanatic!
Joined: May 2015
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From: Miami, FL
2003 CL 600
It may be another pump running, it's hard to say. There are several. Even auxiliary coolant pumps to keep the turbos at a controlled temperature as the car cools down. Anything can run at weird times after shutdown if the conditions are right.
