Hi. I've got a 2011 GL450 with Airmatic semi-active code 489. We've had a periodic "malfunction" warning for a while and a specialist said it was ok for a bit as it wasn't sinking when turned off. In the past few weeks I have heard the compressor working harder and, the other day, on a 700 mile round trip it was extremely bumpy, suspension was down and never came out and I couldn't hear the compressor. The suspension has always been level. Questions:
1) Do I just replace the compressor & relay and see if it temporarily solves the issue?
2) Have the dealership do a full diagnostic and just replace everything (*guessing $3K?)?
3) Find a conversion kit and have my independent shop do a conversion (any idea where and how much a conversion kit is?)?
We are leaving on another trip that will be about 2500 miles over 2 weeks on the 16th.