Didn't check the filter for the air suspension, only checked and cleaned the fan and cooling core for the rear A/C, the vibration was the rear air conditioner, not the suspension, where is the air suspension filter Paul ??
The dust in the cooling core was moist, so we had to be gentle getting that out of the fins, there was also a build up of basically mud at the bottom of the core, I think this may be a regular service item from now on.
So anyone that does a lot of touring and dirt roads, if you have rear A/C, either service it yourself(it's not hard to do) or add it to your major services.
Baz.

