Auxiliary Climate Control - Overview: Overview

The cabin coolant heater system provides warm coolant to the heater core to warm the passenger compartment whenever the DATC module request heat and the vehicle is in a driving mode, remoted started, or doing Cabin Drive-Conditioning.

The cabin coolant heater system consists of the following components:

• Cabin heater coolant pump
• Cabin coolant heater
• Cabin heater coolant diverter valve
• Heater core
• Cabin heater coolant temperature sensor (also known as ECT sensor 2)