Hyundai Ioniq: Heater / PTC Heater. Repair procedures

Hyundai Ioniq (AE) 2017-2025 Service Manual / Heating, Ventilation and Air Conditioning / Heater / PTC Heater. Repair procedures

Inspection

Operating Logic Test (Manual only)

Inspect the PTC operation by confirmation logic as follows.

Entering

(1)	Set the Floor mode and maximum heating position.

(2)	Turn off the blower switch.

(3)	Press the intake (recirculation) button 5 times or more.

(4)	\Indicators of intake and A/C button are continuously flashed with an interval of 0.5 seconds.

(5)	Confirm the PTC operation by turn on the blower switch.

(6)	Each PTC relay is operated with an interval of 3 seconds.

(7)

The logic test will be automatically cancelled after 30 seconds.

In addition, it can be cancelled by followings.

•	Select A/C or intake (recirculation) switch

•	Ignition switch OFF

Cancellation

•	Select A/C or intake (recirculation) switch.

•	Turn the ignition switch OFF.

•	The test is cancelled automatically after 30 seconds.

3.	If the PTC is not operated, substitute with a known-good PTC heater and check for proper operation. If the problem is corrected, replace the PTC heater.

Operating Test

This test should be performed in the PTC ON conditions.

1.	Run the engine.

Check the current on wiring with a clamp multi tester.

Pattern	Current (A)
PTC 1 ON	0.1 - 33
PTC 2 ON	0.1 - 33
PTC 3 ON	0.1 - 33
Total	0.1 - 100

3.	If the current is not specification, inspect related wiring.

Resistance Test

1.	Turn the ignition switch OFF.

2.	Disconnect the PTC heater connector.

Measure the resistance between terminal 1, 2, 3 of PTC heater and ground line.

Resistance : 0.3 - 1.5 Ω

PTC 1

PTC 2

PTC 3

4.	If the measured resistance is not specification, replace the PTC heater with new one.

Replacement

1.	Disconnect the negative (-) battery terminal.

2.	Remove the floor console side cover. (Refer to Body - "Floor Console Assembly")

3.	Disconnect the duct sensor connector (A).

4.	Remove the driver's side shower duct (B) after loosening the screw.

5.	Disconnect the PTC heater connector (A).

6.	Remove the PTC heater core (A) after loosening the PTC heater mounting screws.

7.	To install, reverse the removal procedure.

PTC Heater. Description and operation

DescriptionThe PTC (Positive Temperature Coefficient) heater is installed at the exit or the backside of the 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 hybrid engine...

Evaporator Core. Repair procedures

Replacement1.Disconnect the negative (-) battery terminal. 2.Remove the heater and blower assembly.(Refer to Heater - "Heater Unit") 3.Remove the evaporator core cover (A) after loosening the mounting screws...

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Hyundai Ioniq (AE) 2017-2025 Service Manual: General safety information and caution

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