Auxiliary Electric HeaterHmmm, never heard of that.
Vehicles equipped with a diesel engine come with an auxiliary electric heater. This 12V electrically powered heating element is positioned directly behind the regular coolant flow based heater core in the HVAC case. All airflow goes through the regular heater core first, and then through the auxiliary electric heater. The auxiliary electric heater is active when the outside ambient temperature is below 8°C (46°F) , the coolant temperature is below 75°C (167°F), and the temperature air mix door is near the full hot position.
