@amirhz
Finally got around working on my air suspension. Last week we had an unusual cold snap of -10 to-15C, and my air suspension appeared to freeze up. I know the front air bags had a minor leak, thus the system must be pulling in outside, moisture-laden air to compensate. I repaired the leak, it was the fittings going into the airbags. Tightened them up and no more leaks. But I wanted to drain, vacuum, and refill my system with pure nitrogen, so that's what I did today.
I'm using ODIS for this, but I believe VCDS has the available adaptation channels too.
First, you need to bleed the entire system (each airbag and the accumulator).
![Image]()
Which results in hardparked stance
![Image]()
I left about 2 bar of air pressure in each airbag so that I could disconnect each individual line at the valve block and eliminate any moisture left in the bag or airline. Next I removed the right side sill cover, then disconnected the airlines and removed the compressor assembly.
![Image]()
I then disassembled the compressor as I wanted to replace the piston and cylinder jug as well as clean it out and check the drier cartridge. The drier cartridge seemed brand-new.
![Image]()
![Image]()
Old vs new piston and cylinder jug
![Image]()
![Image]()
I reassembled the compressor assembly, installed it back into the car, then prepared to vacuum the entire system to pull the last remains of moisture and air. You need a proper AC recovery machine or some sort of vacuum pump, and an R134A low-side service fitting.
![Image]()
![Image]()
![Image]()
Finally got around working on my air suspension. Last week we had an unusual cold snap of -10 to-15C, and my air suspension appeared to freeze up. I know the front air bags had a minor leak, thus the system must be pulling in outside, moisture-laden air to compensate. I repaired the leak, it was the fittings going into the airbags. Tightened them up and no more leaks. But I wanted to drain, vacuum, and refill my system with pure nitrogen, so that's what I did today.
I'm using ODIS for this, but I believe VCDS has the available adaptation channels too.
First, you need to bleed the entire system (each airbag and the accumulator).
Which results in hardparked stance
I left about 2 bar of air pressure in each airbag so that I could disconnect each individual line at the valve block and eliminate any moisture left in the bag or airline. Next I removed the right side sill cover, then disconnected the airlines and removed the compressor assembly.
I then disassembled the compressor as I wanted to replace the piston and cylinder jug as well as clean it out and check the drier cartridge. The drier cartridge seemed brand-new.
Old vs new piston and cylinder jug
I reassembled the compressor assembly, installed it back into the car, then prepared to vacuum the entire system to pull the last remains of moisture and air. You need a proper AC recovery machine or some sort of vacuum pump, and an R134A low-side service fitting.
