High pitched whistling noise
Thread Starter
Newbie
Joined: Jan 2022
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C180 2017
High pitched whistling noise
My C180 (2017) makes a high-pitched whistling noise while it's parked. This starts around 20 minutes after I stopped and seems to be worse if I've used the air-con. It's loud, annoying and embarrassing and can go on for quite a while. Also, it started about a month after I bought the car and seems to be getting worse. I've found that it stops quite quickly if I open the windows, but obviously that's not a very robust solution...
The car only has 54,000 km on the clock and is still in the maintenance plan. However, the dealers say this is an engine temperature regulation mechanism and is normal...?
I have 2 problems with that explanation:
1. Why is it worse when I use the air-con?
2. Why does it stop if I open the car windows?
Has anyone else experienced this? The car is going in for it's next service soon and I need to convince the dealers to fix it, it's driving me nuts!
The car only has 54,000 km on the clock and is still in the maintenance plan. However, the dealers say this is an engine temperature regulation mechanism and is normal...?
I have 2 problems with that explanation:
1. Why is it worse when I use the air-con?
2. Why does it stop if I open the car windows?
Has anyone else experienced this? The car is going in for it's next service soon and I need to convince the dealers to fix it, it's driving me nuts!
Last edited by Eben50; Jan 29, 2022 at 02:44 AM. Reason: Youtube link
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Joined: Jun 2017
Posts: 2
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W202 C200 93' and W123 230CE 84'
Did you find the problem?
I do drive a C180 W205 1/2016 with same noise
It started yesterday at 84.000km and i noticed it while parking at home (hot oil/hot water, drove it 35km on the road before)
Maybe it is a failing bearing from a water pump or a tube that gets clogged? does not sound healthy or normal to me..
I ask because currently even Mercedes is loaded to 1month wait on any appointment here in the north of Germany :-/
It started yesterday at 84.000km and i noticed it while parking at home (hot oil/hot water, drove it 35km on the road before)
Maybe it is a failing bearing from a water pump or a tube that gets clogged? does not sound healthy or normal to me..
I ask because currently even Mercedes is loaded to 1month wait on any appointment here in the north of Germany :-/
Senior Member
Joined: Dec 2014
Posts: 480
Likes: 33
From: Waterloo, Ontario Canada
C300 4Matic Tenorite Grey
Sounds like a leaky sunroof and yes the AC can move enough air to cause the noise.
Check the plastic sliders that often break over time.
Have you had to replace the auxiliary battery lately? Turns out the sunroof needs to go through an open/shut synchronization with the MB star system at the dealership.
Check the plastic sliders that often break over time.
Have you had to replace the auxiliary battery lately? Turns out the sunroof needs to go through an open/shut synchronization with the MB star system at the dealership.
Thread Starter
Newbie
Joined: Jan 2022
Posts: 2
Likes: 1
C180 2017
I do drive a C180 W205 1/2016 with same noise
It started yesterday at 84.000km and i noticed it while parking at home (hot oil/hot water, drove it 35km on the road before)
Maybe it is a failing bearing from a water pump or a tube that gets clogged? does not sound healthy or normal to me..
I ask because currently even Mercedes is loaded to 1month wait on any appointment here in the north of Germany :-/
It started yesterday at 84.000km and i noticed it while parking at home (hot oil/hot water, drove it 35km on the road before)
Maybe it is a failing bearing from a water pump or a tube that gets clogged? does not sound healthy or normal to me..
I ask because currently even Mercedes is loaded to 1month wait on any appointment here in the north of Germany :-/
I still have the car and still occasionally hear it, though it's much less frequent now. I'm on 73,000km now and it started at around 51,000km.
Please let me know if they find the cause over there in Germany
