Hyundai Sonata LF: Heater / Temperature Control Actuator Repair procedures

Hyundai Sonata LF 2014-2019 Service Manual / Heating, Ventilation and Air Conditioning / Heater / Temperature Control Actuator Repair procedures

Inspection

1.	Turn the ignition switch OFF.

2.	Disconnect the temperature control actuator connector.

Verify that the temperature control actuator operates to the cool position when connecting 12V to terminal 3 and grounding terminal 7.

Verify that the temperature control actuator operates to the warm position when connected in reverse.

[ DATC-LH]

1. -
2. -
3. Cool position
4. Sensor (+ 5V)

5. Feedback signal
6. Sensor ground
7. Warm position

[DATC-RH / MTC]

1. -
2. -
3. Warm position
4. Sensor (+ 5V)

5. Feedback signal
6. Sensor ground
7. Cool position

4.	Connect the temperature control actuator connector.

5.	Turn the ignition switch ON.

Check the voltage between terminal 5 and 6.

Specification

[ DATC-LH]

Door Position	Voltage (V)	Error Detecting
Max. cooling	1.2	Low voltage : 0.1V or less High voltage : 4.9V or more
Max. heating	4	Low voltage : 0.1V or less High voltage : 4.9V or more

[DATC-RH / MTC]

Door Position	Voltage (V)	Error Detecting
Max. cooling	4	Low voltage : 0.1V or less High voltage : 4.9V or more
Max. heating	1.2	Low voltage : 0.1V or less High voltage : 4.9V or more

It will feedback the current position of the actuator to controls.

7.	If the measured voltage is not within specification, substitute with a known-good temperature control actuator and check for proper operation.

8.	Replace the temperature control actuator if it is proved that there is a problem with it.

Diagnosis With GDS

The heating, ventilation and air conditioning can be quickly diagnosed failed parts with vehicle diagnostic system (GDS).

? The diagnostic system (GDS) provides the following information.

(1) Self diagnosis : Checking the failure code (DTC) and display.

(2) Current data : Checking the system input/output data state.

(3) Actuation test : Checking the system operation condition.

(4) Additional function : Other controlling such as he system option and zero point adjustment.

2.	Select the 'Car model' and the system to be checked in order to check the vehicle with the tester.

3.	Select the 'Current data" menu to search the current state of the input/output data. The input/output data for the sensors corresponding to the Temperature Control Actuator can be checked.

4.	To perform compulsory operation on Temperature Control Actuator input factors, select "ACTUATION TEST".

Replacement

[Driver's side]

1.	Disconnect the negative (-) battery terminal.

2.	Remove the crash pad lower panel. (Refer to Body - "Crash Pad Lower Panel")

3.	Remove the driver's side shower duct (A) after loosening the screw.

4.	Disconnect the connector (A) and then remove the driver's side temperature control actuator (B) after loosening the mounting screws.

5.	Install in the reverse order of removal.

[Passenger's side]

1.	Disconnect the negative (-) battery terminal.

2.	Remove the glove box housing. (Refer to Body - "Glove Box Housing")

3.	Remove the passenger's side shower duct (A) after loosening the screw.

4.	Disconnect the connector (A) and then remove the passenger's side temperature control actuator (B) after loosening the mounting screws.

5.	Install in the reverse order of removal.

Temperature Control Actuator Description and Operation

Description The temperature control actuator is located at the heater unit. It regulates the temperature by the procedure as follows. The signal from the control unit adjusts the position of the temperature door by operating the temperature switch...

Mode Control Actuator Components and Components Location

C..

Other information:

Hyundai Sonata LF 2014-2019 Service Manual: Troubleshooting

Troubleshooting SymptomPossible causeRemedyHard steeringImproper front wheel alignmentExcessive turning resistance of lower arm ball jointLow tire pressureNo power assistCorrectReplaceAdjustRepair or replacePoor return of steering wheel to centerImproper front wheel alignmentCorrectPoor or rough rideImproper front wheel alignmentMalfunctioning shock absorberBroken or worn stabilizerBroken or worn coil springWorn lower arm bushingCorrectRepair or replaceReplaceReplaceReplace the lower arm assemblyAbnormal tire wearImproper front wheel alignmentImproper tire pressureMalfunctioning shock absorberCorrectAdjustRepair or replaceWanderingImproper front wheel alignmentPoor turning resistance of lower arm ball jointLoose or worn lower arm bushingCorrectReplaceRetighten or replaceVehicle pulls to one sideImproper front wheel alignmentExcessive turning resistance of lower arm ball jointBroken or worn coil springBent lower armCorrectReplaceReplaceRepair or replaceSteering wheel shimmyImproper front wheel alignmentPoor turning resistance of lower arm ball jointBroken or worn stabilizerWorn lower arm bushingMalfunctioning shock absorberBroken or worn coil springCorrectReplaceReplaceReplaceRepair or replaceReplaceBottomingBroken or worn coil springMalfunctioning shock absorberReplaceRepair or replace Wheel /tire noise, vibration and harshness concerns are directly related to vehicle speed and are not generally affected by acceleration, coasting or decelerating...

Hyundai Sonata LF 2014-2019 Service Manual: Crash Pad Under Cover Repair procedures