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AC noise

     
Old Sep 26, 2022 | 09:42 AM
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Merserybenze
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2022 AMG GT 53, 2020 Sl450. Did drive 2018 S450
AC noise
On my 2018 450 I started to notice a sound coming from the middle two front vents. It sounds like water bubbling. Not affected by turning the two vents off. Sound disappears when I turn the AC off. Any ideas?
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Old Sep 26, 2022 | 03:32 PM
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'16 S550 Coupe, '11 Lexus LS460, '02 CL500 (SOLD)
Is the A/C evaporator drain clogged? There should be water dripping on the ground as I'm sure you know.
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Old Oct 21, 2022 | 03:00 PM
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2022 AMG GT 53, 2020 Sl450. Did drive 2018 S450
It was a matter of time! Heat/cold can not be modulated. It’s either cold or hot. I can’t get the air temperature anywhere in between. Suddenly happened today. Any ideas before I drag it off the dealer? Tried all sorts of settings, ac on/off, auto, air distribution etc. No luck.
Last edited by Merserybenze; Oct 23, 2022 at 02:02 PM.
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Old Oct 23, 2022 | 02:02 PM
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2022 AMG GT 53, 2020 Sl450. Did drive 2018 S450
Nobody had this issue?
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Old Apr 3, 2024 | 06:36 AM
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2018 s450
I have the same problem trying to figure it out
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Old Apr 3, 2024 | 09:41 AM
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Water bubbling or hissing?
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Old Dec 22, 2025 | 08:49 PM
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2020 S560
Did you resolve this
Originally Posted by JonB305
I have the same problem trying to figure it out
hey, did you find a solution for this ?I have a 2018 s560 and I started noticing a hissing sound from the two front vents and the AC is not cooling as it should .
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Old Dec 22, 2025 | 08:50 PM
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2020 S560
Originally Posted by VII
Water bubbling or hissing?
more of a hissing sound for me that only happens when the AC is turned on , then goes away after about an minute or two ..and the cooling effeciency has drastically reduced
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Originally Posted by Muheavvy
more of a hissing sound for me that only happens when the AC is turned on , then goes away after about an minute or two ..and the cooling effeciency has drastically reduced
It has lost refrigerant or has an A/C compressor that is unable to move enough refrigerant to cool.
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Old Dec 23, 2025 | 10:24 PM
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Originally Posted by Merserybenze
It was a matter of time! Heat/cold can not be modulated. It’s either cold or hot. I can’t get the air temperature anywhere in between. Suddenly happened today. Any ideas before I drag it off the dealer? Tried all sorts of settings, ac on/off, auto, air distribution etc. No luck.
Heater control valve?
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