Hyundai Palisade: Heater / PTC Heater (Diesel only)

Hyundai Palisade (LX2) 2020-2024 Service Manual / Heating,Ventilation And Air Conditioning / Heater / PTC Heater (Diesel only)

Description and operation
Description
The 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 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.

Hyundai Palisade. Description and operation

Operation Principle
ECM outputs a PTC ON signal and operates PTC relay 1. Then the heater controller operates PTC relay 2 with an interval of 15 seconds.
Operating Condition
PTC heater operates according to the following conditions :
Battery voltage : 13V or above
Engine : Running
Ambient temperature and coolant temperature

Hyundai Palisade. Description and operation

Repair procedures
Inspection
Operating Logic Test (Manual only)
Inspect the PTC operation with the confirmation logic below :
1.
Entering
(1)
Set the mode to FLOOR.
(2)
Set the temperature to MAX HOT.
(3)
Turn off the blower switch.
(4)
Press the intake (recirculation) button 5 times or more.
2.
Forced operation
(1)
Non-A/C : The intake button indicator will blink with an interval of 0.5 second for 30 seconds.
With A/C : The intake and A/C button indicator will blink with an interval of 0.5 second for 30 seconds.
(2)
The PTC2 and PTC3 will operate by turning on the blower switch.
PTC2 and PTC3 will operate with an interval of 3 seconds.
PTC2 and PTC3 will trun off simultaneously when the blower switch is turned off.
Only PTC2 and PTC3 will be forced operated.
3.
Cancellation
(1)
Select A/C or intake (recirculation) switch.
(2)
The test cancels automatically after 30 seconds.
(3)
Turn the ignition switch off.
Operating Logic Test (DATC only)
The operating logic test can be confirmed with GDS.
Operating Test
This test should be performed in the PTC ON conditions.
1.
Run the engine.
2.
Check the current on the 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 within specification, inspect the related wiring.
Resistance Test
1.
Turn the ignition switch OFF.
2.
Disconnect the PTC heater connector.
3.
Measure the resistance between terminal 1, 2, 3 of PTC heater and ground line.
Resistance : 0.3 ~ 1.5Ω

Hyundai Palisade. Repair procedures

1)
PTC 1
2)
PTC 2
3)
PTC 3
4.
If the measured resistance is not within specification, replace the PTC heater with a new one.
Replacement
1.
Disconnect the negative (-) battery terminal.
2.
Remove the console side cover (A).
[LH]

Hyundai Palisade. Repair procedures

3.
Remove the PTC heater connector (A).

Hyundai Palisade. Repair procedures

4.
Loosen the PTC heater core mounting screws (A).

Hyundai Palisade. Repair procedures

5.
Remove the PTC heater core (A).

Hyundai Palisade. Repair procedures

6.
Install in the reverse order of removal.

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