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My car started making whistling noises recently. I first noticed when I was inside the car on idle for around 15minutes while I was cleaning the dashboard. Then I started hearing a strange noise which changed to a low whistling sound then get louder and louder - it sounds like a tea pot kettle when it’s ready.

I followed the noise and found that it was coming from under the car a bit a the back maybe between the back tires. My initial thoughts are it could be a leaking hose? Because it sounds like air excaping from a tiny hole from a tire but it’s not coming from the tires and the sound only starts when the engine is on.

I tried opening all the doors maybe it’s a door seal leak but nope. I tried turning the ac on and off but still no change. It also happen when I switch the car on (turning the key ready for starting).

Anyone encountered this issue before? Its a ford focus 2014 Mk3

Here’s a video of the noise:

https://youtu.be/6K64l9N2FRU
 

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My car started making whistling noises recently. I first noticed when I was inside the car on idle for around 15minutes while I was cleaning the dashboard. Then I started hearing a strange noise which changed to a low whistling sound then get louder and louder - it sounds like a tea pot kettle when it’s ready.

I followed the noise and found that it was coming from under the car a bit a the back maybe between the back tires. My initial thoughts are it could be a leaking hose? Because it sounds like air excaping from a tiny hole from a tire but it’s not coming from the tires and the sound only starts when the engine is on.
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I tried opening all the doors maybe it’s a door seal leak but nope. I tried turning the ac on and off but still no change. It also happen when I switch the car on (turning the key ready for starting).

Anyone encountered this issue before? Its a ford focus 2014 Mk3

Have you figured out the issue yet? Do you think the whistling noise is being made by vacuum leak? It could be worn or cracked hose.
 
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