PTC (POSITIVE TEMPERATURE COEFFICIENT) HEATER INSPECTION [FULL-AUTO AIR CONDITIONER]

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1.  Allow the engine to cool down completely.

2.  Remove the ambient temperature sensor and apply a resistance of approox.12 kilohms (equivalent to -10 °C {-14.0 °F}).

3.  Connect the PTC heater ground wiring harness (black) to a tester.

4.  Set the fan switch at MAX HI and the temperature setting dial at MAX HOT, start the engine, and then measure the current.

•  If not within specification, remove the PTC heater.

Current value (approx. quantity)

12.8—27.4 A