Check for a panel in storage area, mine is behind the wall, 32 inches in and in very hard place to reach. Found it did not have a cartridge, went an bought external omni filter, installed @ power post, now no issue. Don't have to empty cargo area to reach.
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2010 DURAMAX 4x4 Crew Cab Redwood, 36FL with the BEST PERSON in the WORLD; my REDHEADED LADY!
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