2005 Buick park ave
Do you mean air-adjustable air shocks, like the nitrogen filled shocks or air-ride suspension?
Air ride suspension I believe
My suggestion is convert to coil springs and do away with air-suspension bladders, compressor, height sensor, and ll the delicate electronics that are related. You will fell little to no difference in ride, matter of fact better in cornering. Can be done for less that $800 installed. When an air-ride suspension gets near 10 years old it will domino , one thing after another. I speak from experience, not just guessing. depending on what is wrong, probably the air-bladders have worn out and have rips in them, or compressor, height sensor, and on and on you will spend a couple hundred then something else in the system will fail and you are right back where you started. There are several, but the very best place to shop for this conversion is: http://www.suncoreindustries.com/buick-suspension-parts.php
Looking for a Used Park Avenue in your area?
CarGurus has 455 nationwide Park Avenue listings starting at $4,991.
Search Buick Park Avenue Questions
Buick Park Avenue Experts