I'm posting here to see if any of this make sense to anyone or if anyone has had similar issues.
I have a 2007 CLS550. I've replace both front shocks/struts and I've replace both rear air strut with arnott replacements. One of my arnott replacements died after 18 months (front passenger), and was replaced under warranty.
Everything was driving pretty good, but I started to notice some "boaty" feel to the car. I've had the car in the shop at least three times for this. Each time, I'm told a lower control arm, or a ball joint, or the alignment is the issue. I've replaced all arms, ball joints, thrust arms, and had the car aligned, but yet, the boat like feel (rocking) is still there.
All shops hook up the computer and say the computer tells them the ride height is correct. Diagnostics show everything is fine on the computer.
Frustration is not the right word. I just want the awesome ride this car used to have back. I try to do some of my own tests and I start to notice it getting worse and worse. Finally, I think I know it is to do with the driver front, or passenger rear, that diagonal line. I then notice the passenger rear is about 1 inch higher than the driver rear.
I take it back in to the shop and they check it out. At this time, I learn some new things. I learn the computer only allows for three areas of calibration for ride height. You have driver front, passenger front, and one setting for rear. There is no setting for individual sides on the rear.
I then learn that arnott makes the replacement air bag in the rear, but not the shock. That is from Bilstein and is a separate part. a 650.00 part.
The shop takes the car on the lift and does some diagnostics. They think the airbag, arnott strut on the passenger rear is bad. I've replaced this before, but hopefully it will be replaced again under warranty. I've never replaced the air shocks it seems, only the air bags from arnott. I had no idea there were two separate parts, one not from arnott. My car has 150k miles on it, and those air shocks have never been replaced.
Any input? Anyone else have similar issues? Anyone know more about this? Why are there air shocks and air bags? I assume the air shock controls the dampening? and the air bag controls the ride height? I dunno. I thought it was all the same unit like the front. One contained part.
I've put a good amount of money into this suspension. I know I can convert - I don't want to. I'd like to understand and get it fixed. When it works, it is a solid ride and very capable, I want that back.
I would love to learn anything you guys have to tell me. I love this car. I want to keep it for several more years. I just want to understand it