PTC HEATER CONSTRUCTION [FULL-AUTO AIR CONDITIONER]

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• The PTC heater is supplementary heater to assist A/C unit heating performance.

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System Wiring Diagram

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Operation

• The PTC heater relay will turned ON when all of the following conditions are met:

― Blower fan ON.

― Set temperature is MAX HOT.

― Ambient temperature is included in definite value. (See Graph 1.)

― Engine coolant temperature is included in

definite value. (See Graph 2.)

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