E-Class (W211) 2003-2009

Sagging rear of wagon

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Old Feb 12, 2016 | 10:45 AM
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Sagging rear of wagon

Woke this morning to a sagging rear of wagon in single digit temps. 2nd time in 1 month. fixes itself after a few cycles of ignition. air bags or compressor?
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Old Feb 12, 2016 | 11:01 AM
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1922 Ford Model T / no OBD
Is it holding at warmer temperatures thru the day?
You said it yourself that compressor is pumping it up, although required few cycles would indicate deteriorating performance.
In your shoes I would start with compressor service/overhaul. I made pictorial about it.
My first guess would be that moisture in the system freeze something.
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Old Feb 12, 2016 | 11:11 AM
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Originally Posted by kajtek1
Is it holding at warmer temperatures thru the day?
You said it yourself that compressor is pumping it up, although required few cycles would indicate deteriorating performance.
In your shoes I would start with compressor service/overhaul. I made pictorial about it.
My first guess would be that moisture in the system freeze something.
It holds pressure for weeks at a time
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Old Feb 12, 2016 | 01:16 PM
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1922 Ford Model T / no OBD
If it holds for weeks in warm weather, but drops in freezing temperatures, that should give you straight pointer.
When was the last time you serviced the compressor?
I bought my wagon with over 140k and had intermittent suspension warnings, till I finally bought rebuild kit.
Doing the service at the end of very long dry season, I found the drier soak wet, so evidently there is design flaw in the system.
If you keep filling delicate electrovalves with moisture and park the car in freezing temperatures, that is asking for troubles.
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Old Nov 8, 2016 | 02:51 PM
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Problem found,
Turns out it was the "T" fitting that supplies air to the rear air springs is leaking.
Thanks for all the input.
Dan
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Old Nov 8, 2016 | 03:09 PM
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1922 Ford Model T / no OBD
Good you found leak source, but I am afraid you might have more issues.
Leak on supply line will not drop the suspension, unless valves on bags leak in the row as well.
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Old Nov 9, 2016 | 07:59 AM
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Kajtec1,
Took your advice and replaced the right rear spring that was bottoming out in cold weather. Upon start up the right is about an inch shorter than the left side.
Today I will replace the air distributor and see what happens.
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Old Nov 13, 2016 | 08:44 PM
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If the bags are sagging overnight, you have a leak in the bags. There is an isolation valve that locks them off from the system when the car is off. If the car is sagging overnight, it is 100% a bag failure.
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