How do I know which of the Air-Springs L or R, or if their seals are leaking air on 2003 Mercedes-Benz E500

Rear-end of car on both sides goes(Sags) down after (30min) car turned off, goes up when car starts up (w/in 5min). How can I know if 1 or both Air-Springs or any of their seals are leaking air? Could 1 seal be leaking & not both or an air-line damaged & not able to maintain the air pressure? Problem is constant. Thanks

by in West Bloomfield, MI on February 04, 2012
1 answer 1 comment
ANSWER by on February 12, 2012
only can be properly diagnosed at dealer or independent shop with star diagnosis machine. be aware that if rear bags are bad it is a very expensive repair due to extreme amount of work involved.
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COMMENT by on February 20, 2012
thanks Jim, I need to ask you @ dealer each of "air-springs" is $847, web "belestiens it's $620, should I buy from web the L & R & have a mechanic change for me, it will be cheaper than the dealership, as for them to diagns. it's $112. NOTE NOW IM NOTICING ONLY THE REAR LEFT IS SAGGING & NOT (ANYMORE) THE REAR LEFT? SOMEONE TOLD ME IT COULD BE THE SEAL ON 1 OF THEM GONE BAD? DO YOU THINK OF I CHANGE THE REAR RIGHT SIDE AIRSPRING WOULD MAYBE SOLVE THE PROBLEM?? I WOULD APPRECIATE YOUR RESPONSE!!