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Just behind the passenger side front tire, above the frame, where the firewall bends toward the rear of the truck.
Find someone with a bi-directional scan tool and have them activate "Afterblow". This will dry out the evaporator. Have written about in detail on here before.My 07 escalade just starting smelling funny when ac is turned on. Once its been running for a min or 2, smell goes away.
Where can i start checking?