Air hissing from the rear of 2015 Phaeton QBH

[DennisJM]

Just got back from a 3 day trip and am hearing air hissing from rear of coach when engine shut down and parked. Not a tire air hissing but from under the coach itself. When we put the jacks down, it quit. Thanks, Dennis Mattson.

[BFlinn181]

It could be a leaking air spring, your air filter/desiccant cartridge, automatic air tank purgers, etc. If you're not familiar with these systems, you should have them checked. What did your air pressure gauges read on the dashboard? Did the gauges leak down after stopping or stay up? You should also check ride height in the back, if the height is wrong it can damage the drive shaft U-joints and bearing in the end of the transmission.

[Kiawah]

Freightliner warranty item - Call Freightliner help desk in Gaffney. And DON'T be crawling underneath it, unless you are really really really toothpick skinny.

[easyed]

I suspect it may be the hight leveling valve, Klawah is correct this should be a warranty item