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Hi all gurus,

I am driving a Cla180 but I keep hearing a hissing sound from the aircon. When i travel at high speed, I can't really hear the sound. However when i am coming to a stop, the hissing sound gets loud and it's quite irritating. The aircon is still cold all the way which I find it weird. Sent down my car to a workshop also doesn't help. So i went to Tomika to get it fixed but they can't identify the problem and just changed a valve, vacuumed and change the compressor oil. After driving for 5 mins, it's back to normal again. Gas wasn't leaking according to them. Am very irritated with the sound and after spending money to get it fixed, it's still the same.

Would like to ask if anyone faced this issue and get it solved? Thanks so much in advance! :)

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I have this same issue on my CLA45 also. Many 45 owners (A & GLA also) experience this. It's like a water & gas flow noise...whooshing or hissing sound. Well, many have tried flushing & servicing the aircon to no avail. I'm sorry you have done even more unnecessary aircon works. We 45 owners have learned to live with it....thankfully our loud engine & exhaust noise give some noise canceling effect. Lol....

I suggest that u turn up the radio volume.  

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On 3/16/2018 at 9:29 PM, jtang said:

I have this same issue on my CLA45 also. Many 45 owners (A & GLA also) experience this. It's like a water & gas flow noise...whooshing or hissing sound. Well, many have tried flushing & servicing the aircon to no avail. I'm sorry you have done even more unnecessary aircon works. We 45 owners have learned to live with it....thankfully our loud engine & exhaust noise give some noise canceling effect. Lol....

I suggest that u turn up the radio volume.  

Haha.. You are right, it's like water $ gas flow noise. It's so irritating. Now it is just getting worse with the hissing sound going on non-stop. Gosh..

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  • 8 months later...

Hi Noobie, opening up an old thread..have the same problem and read from overseas forum that its caused if the A/C air has insufficient return air into cabin due to clog up filter or other factors that minimize air circulation..the A/C tries to compensate by sucking in harder thus the whispering / hissing sound..

Wonder if any Bros manage to solve this issue? Im gona try to replace the filter. Do share your thought, Many thanks!

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