System Revisions
WARNING: This page is about a different car, the 2004 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
The 2004 WJ/WG HVAC systems remain mostly carryover from 2002. However, the 2003 and above model year AZC Module is NOT interchangeable with other model year AZC Modules due to revised control software.