Section 21 (HVAC Systems - Manual): Operation: Notes
WARNING: This page is about a different car, the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, and 2002 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
There are multiple HVAC controls available with this vehicle. They include front control assembly, front and rear auxiliary control assemblies, and auxiliary blower switch. HVAC control assemblies and HVAC control processor do not utilize class 2 communications.