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Vehicles Equipped With Auto Start-Stop

Vehicles with auto start-stop feature are equipped with a cabin heater coolant pump. The cabin heater coolant pump provides coolant to the heater core whenever the HVAC system requests heat and the vehicle is in auto start-stop mode. The PCM sends a PWM signal to control the cabin heater coolant pump to increase the flow of coolant to the heater core. Refer to the Owner's Literature, Unique Driving Characteristics for full auto start-stop enabling/disabling information.

The PCM sends a PWM signal to the cabin heater coolant pump based upon the following:

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