Heard yesterday morning but appears to be intermittent and no change in suspension height after a long motorway journey (and no warning messages) - is this a "wheel off and spray the air suspension with soapy water test" ?

Is it a click then a hiss ? If so could just be the car levelling itself out . 2008 MY Supercharged
Rimini Red / Jet
four zone climate
remote park heater
and no ugly kid windows.
magnus satis quod turpis satis

Sadly just a hiss - it seems to self level quite happily without any clicks or hissing.

Are you sure it's not just the rear suspension dropping to access height?
Mine drops a wee bit on the rear when I turn it off to allow access to the boot. 

Could be the pressure relief valve at the compressor dumping excess air as the car comes to a halt.

Try putting it in off road hight and leave over night. If its down at one corner I would say you have a leak

You are catching on Bob  .
Experience is the only genuine knowledge, but as time passes, I have forgotten more than I can remember
Volvo V70 P2 2006 2.4 Petrol 170bhp Estate SE
MG Midget Mk1 1962

Previous: L322 Range Rover TDV8 3.6 2008; L322 Range Rover TD6 3.0 2002; P38A Range Rover V8 1999

Joe Ive only had experiance with the front and what to keep it that way

Left in off road height overnight and it was the same height at each corner in the morning - so maybe it was a pressure relief valve at the compressor dumping excess air (I first noticed this on a warm day).

Fingers crossed your right

VaguelyVogue wrote:

Left in off road height overnight and it was the same height at each corner in the morning - so maybe it was a pressure relief valve at the compressor dumping excess air (I first noticed this on a warm day).

Most FF's wont achieve full height with an air leak... Most leaks are masked somewhat by the construction of the bags and as they extend the leak gets bigger, hence most not achieving full off road height...


Craig

Hmmm - I didn't of course measure the actual height reached Craig, just that the car moved up !

However, whilst on a couple of 250 mile drives this weekend there was a dashboard warning message along the lines of "suspension height adjustment off, normal height only" and the lights went off on the height control display.

When driving back in cooler weather last night, the lights were all on again and no messages - so I'm starting to think that there is a leak somewhere (matching the intermittent hiss) and the compressor is running too long and possibly overheating.

Sounds like my local garage will be getting a visit - I couldn't find a leak with the rear wheels off on Sunday morning, but it doesn't hiss all the time.

Have you tried taking your spare wheel out and checking if the leak is from the compressor, or is the hiss definatly ouside the car?

Cam-Tech-Craig wrote:

Most FF's wont achieve full height with an air leak...

Quote:

Most leaks are masked somewhat by the construction of the bags and as they extend the leak gets bigger

Ok - more weekend testing is obviously needed - thanks for the hints on finding the potential leak!

As an aside, when I was jacking up the car to remove the wheels are the weekend, the only way that I could stop the suspension adjusting itself was to lock the suspension in access mode (I tried drivers door left open, boot lids left open and passenger door left open - but each time I raised the car it adjusted the suspension).