If the air solenoid valve is not on the firewall you might check behind the upper cabinets.
When I changed the TV out on my 2002 Windsor I found mine up there right below where the air horn is mounted on the roof.
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Jim J
2002 Monaco Windsor 38 PKD Cummins ISC 350 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi
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