Hyundai Venue (QX): Heater / PTC Heater. Description and operation

Hyundai Venue (QX) (2020-2026) Service Manual / Heating, Ventilation and Air Conditioning / Heater / PTC Heater. Description and operation

Description
The PTC (Positive Temperature Coefficient) heater is installed at the exit or the backside of heater core.
The PTC heater is an electric heater using a PTC element as an auxiliary heating device that supplements deficiency of interior heat source in highly effective diesel engine. The electric heater heats up the interior by directly heating the air that passes through the heater. The name itself implies that the element has a proportional resistance change sensitive to temperature.
Operation Principle
ECM outputs a PTC ON signal and operates PTC relay 1. Then heater controller operates PTC relay 2 and PTC relay 3 with an interval of 15 seconds.
However, PTC relay 3 can be operated while battery voltage is above 12.4V.
Operating Condition
PTC heater operates according to the following conditions.
•
Battery voltage: 12.4V or above
•
Engine : Running
•
Ambient temperature and coolant temperature
Ambient
Temperature
Coolant
Temperature
PTC
Operation
Below -20°C
(-4°F)
 Below 75°C (167°F)
 ON
10°C (50°F)
 Below 65°C (149°F)
 ON
12°C (53.6°F) or above
 -
 OFF
-
 80°C (176°F) or above
 OFF

Hyundai Venue. PTC Heater. Description and operation

    Replacement 1. Remove the heater unit assembly. (Refer to Heater - "Heater Unit") 2.

    Inspection Operating Logic Test (Manual only) Inspect the PTC operation by confirmation logic as follows; 1. Entering (1) Set the Floor mode and maximum heating position.

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    Hyundai Venue (QX) (2020-2026) Service Manual: Troubleshooting

    Diagnosis with Diagnostic tool 1. In the body electrical system, failure can be quickly diagnosed by using the vehicle diagnostic system (Diagnostic tool). The diagnostic system (Diagnostic tool) provides the following information.

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