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Hyundai Tucson: Heater - Inspection

Hyundai Tucson - Fourth generation (NX4) - (2020-2023) - Workshop Manual / Heating, Ventilation and Air Conditioning (HVAC) / Heater / Heater - 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.

  1. 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 trim off simultaneously when the blower switch is turned off.
  • Only PTC2 and PTC3 will be forced operated.
  1. 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.

  1. 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 of PTC heater and ground line.

Resistance : 0.3 - 1.5

1)PTC 1

1)PTC 1

2)PTC 2

  1. 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 cowl cross bar assembly.

    (Refer to Body (Interior and Exterior) - "Cowl Cross Bar Assembly")

  3. Loosen the mounting screw, remove the driver's shower duct (A).

  1. Disconnect the PM sesnor connector (A) and hose (B).

  1. Disconnect the PTC heater connector (A) and remove the PTC heater (B).

  1. Install in the reverse order of removal.

WARNING

Make sure the connector is connected properly.

Description

The heater unit includes mode control actuator and temperature control actuator.

The temperature control actuator is located at the heater unit. It regulates the temperature by the procedure as follows.

Signal from control unit adjusts the position of the temperature door by operating the temperature switch. Then the temperature will be regulated by the hot/cold air ratio decided by the position of the temperature door.

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