Electronic Automatic Temperature Control (EATC) Module
WARNING: This page is about a different car, the 2006 Lincoln Navigator and 2006 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
The EATC module uses the medium speed CAN. The EATC module controls automatic climate functions that maintain the vehicle interior temperature at a constant setting. For additional information, refer to CLIMATE CONTROL SYSTEM-GENERAL INFORMATION AND DIAGNOSTICS .