SSANGYONG Rodius 2012.07 Manual page 368

C. PTC operation process
The PTC operating condition (ON) is controlled in two steps.
Basically, the engine ECU controls the relay to supply the power to PTC according to the coolant
temperature sensor and ambient temperature sensor.
▶
1st step (initial operation of PTC)
Coolant temperature < 15°C: PTC ON
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Coolant temperature ≥ 15°C: PTC ON after satisfying the conditions in 2nd step
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▶ 2nd step (coolant temperature ≥ 15°C)
Coolant temperature ≤ 65°C and intake air temperature ≤ -10°C: PTC ON
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Coolant temperature < 60~65°C and intake air temperature < -10~0°C: PTC ON
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Coolant temperature ≤ 60°C and intake air temperature ≤ 0~5°C: PTC ON
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▶
Stop (OFF) conditions
- A/C blower switch OFF
- Defective ambient air temperature sensor (including open or short circuit)
- Engine cranking
- Low battery voltage (below 11V)
- During pre-glow process (glow indicator ON)
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