Wing3443

I have a 2017 c43, when the engine get to the Normal temperature, it have whopping sound, anyone have the experience.

MatthewJ

Sounds like a diaphragm that is trying to move but cant. Not aware of any except the the ones for the boost bypass. Have you checked that the vac line is still connected to those?
Also the area the camera is pointing is a coolant split for the intercooler and radiator, have you run low on coolant and had to top anything off, thinking air bubble stuck at a connector point.
If car is under warranty still, have you been by the service dept, could be a hidden code for a valve actuator or something that is unable to move correctly throwing a soft code.

Wing3443

Thanks
i have check all the vacuum line, no leak, also the coolant is full. The sound is coming from somewhere on top of turbo. I make an appointment on Monday, will update later.

B3NS_C63s_AMG

I drove all the performance cars in Laguna Seca on AMG Academy and for some reason, the new AMG C43 was the best sounding car to my ears. I really liked the way it sounded compared to all other cars I drove on the track.

MyNamesNotJimmy

The "honking or "whooping" noise is a bad transducer - Work Order Details: "Transducer internal diaphram is vibrating, causing the noise. Removed & replaced transducer, performed overnight test - no noise found after over-night test and tranducer swap."

Dartle47

Any update on this my dealer is telling me they can’t confirm the transducer as the issue

Prodbyjr

I had the same problem and they wanted me to pay for a diagnostic even after I showed them several videos of it being a common issue. I have a 2019 C43 sedan and bought it myself and replaced it even though it should have been replaced under warranty.

I believe the part number is "A 000 153 18 00"

Here is another forum on the same issue: https://mbworld.org/forums/c450-c43-...nge-sound.html