I wonder if anyone can help. I have a L405 4.4 diesel, when turning right I get a surging sound fron the rear. I would say its from the wheel well. It doesn't happen when turning left and doesn't happen at all when not moving. The air suspension seem fine and no warning lights. It's been getting louder over the past 500 miles. The rear ACE pipes were changed circa 1000 miles ago. The sound 'surging' is what I would describe as a pump sound......like old power steering if that makes sense?

there is a TSB for fuel slop in the tank, could be that.. ... - .- -.




Y. O. L. O.
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Possibly, however the sound doesn't sound like 'slopping' it's like a suction sound or compressor sound. Very strange it only happens on a right hand turn.

i wonder if you have a bag leak..try going off road mode and listen for air leaks. ... - .- -.




Y. O. L. O.
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Was enough AC fluid replaced after the pipes were renewed? - there are two sets of coolant fluid volume numbers written on the tag under the bonnet depending on the three or four zone a/c.

Do you have the multi-zone air conditioning? - if so, it could be the fan for the rear AC (located behind the boot liner on the left) - pull back the liner (from the top - it is on clips) and make sure the fan is turning and is not clogged when the AC is in operation?

Perhaps drive around with the boot liner off and volunteer/volun-told in the back who can help you further locate and identify the source of the noise. 2017 - L405 SC - WOW! just WOW!
2014 - L405 4.4
2010 - L322 3.6 - Carried me 100,581 miles then broke big-time

There are 10 types of people in this world;
Those that understand binary,
and those that don't.