Hyundai i-30: Heater / PTC Heater

Hyundai i30 (PD) 2018-2025 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

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

[Diesel]

Pin No.	Function
1	PTC 2
2	Gound
3	PTC 1
4	Gound
5	PTC 3

[Gasoline]

Pin No.	Function
1	-
2	Gound
3	PTC ON(+)
4	-

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

Replacement

[Gasoline]

1.	Disconnect the negative (-) battery terminal.

2.	Remove the floor console side cover [LH] (A).

3.	Disconnect the PTC heater connector.

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

5.	To install, reverse the removal procedure.

[Diesel]

1.	Disconnect the negative (-) battery terminal.

2.	Remove the floor console side cover [LH] (A).

3.	Disconnect the PTC heater connector (A).

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

5.	To install, reverse the removal procedure.

Heater Core

Repair procedures Replacement 1. Disconnect the negative (-) battery terminal. 2. Remove the heater and blower assembly...

Evaporator Core

Repair procedures Replacement 1. Disconnect the negative (-) battery terminal. 2. Remove the heater and blower assembly...

Other information:

Hyundai i30 (PD) 2018-2025 Service Manual: Air Ventilation Seat

Components and components location Component Location 1. Ventilation seat blower. 2. Ventilation seat unit (Assist seat only). Schematic diagrams Circuit Diagram Air Ventilation Unit Connector No Connecter A Connecter B Connecter C 1 Seat vent unit IGN 1 Driver vent switch led (Low) vent / heater power 2 Driver blower power Driver vent switch led (Mid) Driver heater power 3 Driver blower speed Driver vent switch led (High) Driver heater ground 4 Driver RPM input Driver NTC (+) Driver / Assist, Vent / Heater ground 5 Driver heater switch - vent / heater power 6 Driver vent switch Illumination (-) - 7 Illumination (+) Driver NTC (-) Assist heater power 8 Driver heater LED (Low) Driver blower ground - 9 Driver heater LED (Mid) Driver vent led (Low) Assist heater ground 10 Driver heater LED (High) Driver vent led (Mid) Driver / Assist, Vent / Heater ground 11 Vent seat unit IGN 2 Driver vent led (High) 12 Assist blower power Assist NTC (+) 13 Assist blower speed - 14 Assist blower RPM input - 15 Assist heater switch Assist NTC (-) 16 Assist vent switch Assist blower ground 17 Detent 18 Assist heater LED (Low) 19 Assist heater LED (Mid) 20 Assist heater LED (High) Repair procedures Removal [Ventilation Blower] 1...

Hyundai i30 (PD) 2018-2025 Service Manual: EGR Cooler

Components and components location Components 1. EGR Cooler assembly 2. EGR cooler water inlet hose 3. EGR gas outlet hose 4. EGR gas temp sensor 5. EGR valve 6. EGR cooler water outlet hose Repair procedures Removal and Installation • Be careful not to damage the parts located under the vehicle (floor under cover, fuel filter, fuel tank and canister) when raising the vehicle using the lift...