Re: changing out the dessicant cartridge and coalescing filter, they don't have anything to do with rain/road moisture but with the moisture formed by the air compressor/pump that is mounted on the engine and is used to inflate the bags and provide air to your brakes.
I will post some of my service pics shortly.
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'98 Gulfstream Sun Voyager Bus - Platinum with 275HP/880Ft/# Cummins and Allison 3060
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