S-Class (W220) 1999-2006: S 320 CDI, S 320, S430, S 500, S 600

W220 Air Suspension Leak

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Old May 20, 2017 | 11:02 PM
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lynchmichael84's Avatar
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1990 350SDL
W220 Air Suspension Leak

The car falls randomly over night, not my car a customer. I used the SDS and narrowed it down to a leak between the valve block and compressor. I cannot find a leak in the lines. Is it possible for the valve block to have a bad valve or do the compressor most likely have a internal leak?
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Old May 21, 2017 | 11:46 AM
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From: Ball Ground, GA (N of Atlanta)
2003 S500 2007 GL450
It is easily possible to have a faulty valve in the block. Rebuilding is reportedly not too difficult.
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Old May 23, 2017 | 03:23 AM
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The line between the valve block and compressor should be pressurized, there is a one way check valve on the compressor that might not be holding sealed.
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Old May 23, 2017 | 07:03 AM
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2013 S550 4MATIC
Originally Posted by lynchmichael84
The car falls randomly over night, not my car a customer. I used the SDS and narrowed it down to a leak between the valve block and compressor. I cannot find a leak in the lines. Is it possible for the valve block to have a bad valve or do the compressor most likely have a internal leak?
I pm'd you as well but if you need a good working valve block let me know.
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