I have search through the postings but .... how does one know the air cells are bad. I have a '95 wagon, the rear shocks have been replaced, but I still feel the ride quality isn't where it should be.

Additionally, where are the cells located in relation to the rear shocks?

Thanks in advance

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)