Hyundai HD78 Heating, Ventilation & Air Conditioning

Heating,Ventilation &

Air ConditioningGeneral

Generals ....................................................... HA - 2Performance Test Diagnosis......................... HA - 4On-Vehicle Inspection .................................. HA - 8Specifications ............................................... HA - 12

Heater and Air Conditioner Control SystemComponents ................................................. HA - 16Inspection ..................................................... HA - 18

Blower AssemblyComponents ................................................. HA - 21Inspection ..................................................... HA - 23

Heater AssemblyComponents ................................................. HA - 26Inspection ..................................................... HA - 28

Air Conditioner AssemblyComponents ................................................. HA - 31Compressor

Components ........................................... HA - 33Inspection ................................................ HA - 35

Condenser Fan and MotorComponents ........................................... HA - 36Inspection ................................................ HA - 37

Receiver DrierComponents ........................................... HA - 38Inspection ................................................ HA - 39

Evaporator UnitComponents ........................................... HA - 40Inspection ................................................ HA - 43

GeneralGeneralsCautions for Handling Refrigerant1. R-134a liquid refrigerant is highly volatile. A drop onthe skin of your hand could result in localizedfrostbite. When handling the refrigerant, be sure towear gloves.

2. It is standard practice to wear goggles or glasses toprotect your eyes, and gloves to protect your hands.If the refrigerant splashes into your eyes, wash themwith clean water immediately.

3. The R-134a container is highly pressurized Neverleave it in a hot place, and check that the storagetemperature is less than 52°C.

4. The R-134a refrigerant and the R-12 refrigerantshould not mixed each other even they are smallamount. If these two refrigerants are mixed, thecompressor will be defective.

5. Use only recommended refrigerant. If the refrigerantsother than the recommended one used, the systemfailure may occur.

6. PAG absorbs the moisture from the atmosphere at arapid rate, therefore, the following precautions shouldbe observed.a. When removing the air-con components from a

vehicle, plug immediately the components toprevent from the moisture with caps.

b. When assembling the components to a vehicle,do not remove the caps until just before installingthe components.

c. Complete the connection of all refrigerant tubesand hoses without delay to prevent the Air-consystem from taking on moisture.

d. Use the recommended lubricant only.

KVTH100A

Replacement Parts of the Air-con System1. Never open or loosen the jointing part beforecompleting the evacuation of gas in the system.

2. Before connecting the jointing parts, seal it at first.Apply refrigerant oil at the jointing parts and sealbefore connecting them.

3. As the parts for R-134a air-con system and those ofR-12 air-con system are not compatible each other,do not use them together.

NOTICEa. If the O-ring used for R-12 system is installed at

the R-134a system, bubbles may be generatedat the O-ring or the O-ring may swell. As a result,the refrigerant may leak.

b. If the compressor oil only used for R-12 systemis applied to the R-134a system, the compressorfailure may occur

KVTH101A

Air flow diagram

EMTHA5001A

Performance Test DiagnosisThe test gauge indicators shown on the following chapterare to be used as typical examples of common problemswhich you may need to diagnose.

Gauge Readings Other Symptoms Diagnosis Correction

Low side High side • Discharge air: slightly cool.

• Thermostatic switch (Ther-mistor):Low side gauge d-oesn't fluctuate with switc-h "ON" and "OFF".

Some air and moisture in syste-m.

1. Check leaks.2. Discharge refrigerant fromsystem.

3. Repair leaks if there are a-ny leak.

4. Replace receiver-drier.The drier is probably satu-rated with moisture.

5. Evacuate the system forat least 30 minutes.

6. Charge system with refrig-erant.

7. Operate system and chec-k performance.

Low side High side • Discharge air: Becomeswarm as vacuum is in lowside cycle.

• Discharge air: Becomeswarm all the time when h-ot.

Excessive moisture in system 1. Discharge refrigerant2. Replace receiver-drier3. Evacuate the system witha recovery/ recycling sys-tem.

4. Recharge the system to p-roper capacity.

5. Operate the system and c-heck performance.

Low side High side • Compressor: Cycle repe-ats on and off too fast.

• Low side gauge: Not eno-ugh range shown on lowside gauge.

Defective thermostatic switch 1. Stop engine and turn air c-onditioning "OFF"

2. Replace thermostatic swit-ch.When installing new ther-mostatic switch, make sur-e that the thermistor is ins-talled in the same positionon the evaporator core asold position.



Low side High side • Compressor: low side pre-ssure builds up too high b-efore compressor turns on(cycle "ON" point too high)

Faulty thermostatic switch 1. Stop engine and turn air c-onditioning "OFF"

2. Repair or replace thermo-static switch with thermist-or (make sure that all wiri-ng is positioned so that noshort circuiting can occurr-ed).


Low side High side • Discharge air: Slightly co-ol.

• System slightly low on refri-gerant

1. Check leaks.2. Discharge refrigerant.3. Repair leaks.4. Check compressor oil lev-el.

5. Evacuate system using arecovery/ recycling system.



Low side High side • Discharge air: Warm • System very low on refrig-erant

• Possible leak in system.

1. Check leaks.2. Leak test compressor sealarea very carefully.

3. Discharge refrigerant.4. Check compressor oil lev-el.

5. Evaporate system using arecovery/ recycling unit.




• Expansion valve: Sweatin-g or frost build up.

• Expansion valve stuck clos-ed.

• Screen plugged.• Sensing bulb malfunction.

1. Discharge system.2. Disconnect inlet line at ex-pansion valve and removeand inspect screen.

3. Clean and replace screenand reconnect inlet line.

4. Evacuate system using arecovery/ recycling unit.



Low side High side • Discharge air: slightly cool.

• High side pipe: Cool andsweating or frost.

• Restriction in high side of s-ystem

1. Discharge system.2. Remove and replace rece-iver drier, liquid pipes orother defective componen-ts.

3. Evacuate system using arecovery/ recycling unit.



Low side High side • Compressor: Noisy • Compressor malfunction 1. Replace compressor.2. Remove compressor cylin-der head and inspect com-pressor.

3. Check compressor oil lev-el.

4. Replace receiver-drier.5. Operate system and chec-k performance.

Low side High side • Discharge air: Warm.• High side pipe: Very hot

• Malfunctioning condenser o-vercharge.

1. Check for loose or worn f-an belt.

2. Inspect condenser for clo-gged air passage.

3. Inspect condenser mounti-ng for proper radiator cle-arance.

4. Check for refrigerant over-charge.



• Large amount of air and moi-sture

1. Discharge refrigerant fromsystem.

2. Replace receiver-drier wh-ich may be saturated withmoisture.

3. Evacuate system using v-acuum pump.




Low side High side • Discharge air: Warm.• Evaporator: Sweating orfrost.

• Expansion valve stuck open 1. Discharge system.2. Replace expansion valve,and dryer making sure allcontacts are clean and se-cure.

3. Evacuate system using arecovery/ recycling unit, t-hen recharge system withrefrigerant.


On-Vehicle InspectionInstallation of Manifold Gauge Set

CAUTIONFor R-12 and R-134a, they are use different kinds ofrefrigerants and lubricants so that they should notbe mixed each other, even it is small amount.Therefore, it is necessary to use special servicetools and equipment for service.If you use the equipments in correctly, therefrigerants or lubricants of the air-con system maybe contaminated.

KVTH103A

1. Close the both hand valves of the manifold gaugeset.

2. Install the charging hose of the gauge set to theservice port (high pressure, low pressure hose port).

KVTH104A

3. Tighten the nut of the manifold gauge set with hand.

KVTH105A

System EvacuationCAUTION

a. When connecting the service equipment, performthe work in accordant with the manufacturer'sinstructions.

b. Do not breathe the refrigerants or vapors.c. If the refrigerants are discharged, ventilate the

working area before resuming the service.1. When the air-con system has been opened to theatmosphere, such as during installation or repair, it isnecessary to evacuate the refrigerant using a R-134aRecovery/Recycling/Charging System. (If the systemhas been opened for several days, the receiver dryershould be replaced and the refrigerant of the systemshould be evacuated for several hours.)

2. Per the equipment manufacturer's instructions,connect the Recovery/Recycling/Charging System(A) to the high pressure service port (B) and the lowpressure service port (C).Then, evacuate the refrigerant from the system.

EQKE004A

3. If the low-pressure does not reach 760mmHg or morein 15 minutes, it means that there is a leak in thesystem.Partially charge the system and check for leaks.

Checking for the Refrigerant LeakageWhen performing the service related to thedisassembling and removing the cooling system orconnection fitting, perform the check for leakage with anelectric leak detector.

NOTICEIn order to use the leak detector properly, read themanual supplied by the manufacturer before using it.1. Check the torque of the connection fittings. If it is tooloose, tighten it to the specified torque.Check for gas leakage with the leak detector.

2. If the gas leakage continues even after the fitting hasbeen tightened properly, then discharge therefrigerant from the system, disconnect the fitting andcheck for damages.

3. Check the compressor oil. If needed, replenish theoil.

EQKE007A

System ChargingCAUTION

a. When connecting the service equipment, performthe work in accordance with the manufacturer'sinstructions.

b. Do not breathe the refrigerants or vapors.c. If the refrigerants are discharged, ventilate the

working area before resuming the service.1. Per the equipment manufacturer's instructions,connect the Recovery/Recycling/Charging System(A) to the high pressure service port (B) and the lowpressure service port (C).Then, evacuate the refrigerant from the system.

EQKE004A

2. Add the same amount of new refrigerant oil to thesystem that was removed during recovery.

NOTICEUse only the specified refrigerant oil, FD46XG(PAG).

3. Charge the system with specified amount of R-134arefrigerant.Do not overcharge the system. If doing so, thecompressor may be damaged.

Amount of the Air-con Ref-rigerant

500±20g (D4GA Engine)425±20g (D4DD Engine)625 ± 20g (D4AE, D4AF,D4DC Engine)600 ± 20g (D4AL, D4DA,D4DB Engine)570 ± 20g (D4AL, NARR-OW)

Inspection before driving[Except D4GA engine]1. Check if the condenser pin is clogged or damaged.If the condenser pin is clogged, clean it with cleaner.

CAUTIONWhen cleaning the condenser pin, be careful notto damage it.

2. Check if the drive belt is properly installed in thepulley groove.

3. Check the tension of the drive belt.

CAUTIONIf the tension of the belt is not proper, it causesthe inferior in the performance of the air-con orin the duration of the drive belt.

V-belt Tension (After Driving) 6 ~ 9mm

EMTHA5002A

4. After loosen the adjusting nut of the idler pulley,move the idler pulley to control the tension of thedriver belt.

EMTHA5003A

EMTHA5004A

5. Crank the engine.6. Turn on the switch of the Air-con.

NOTICECheck if the blower switch operates normally at eachposition.

7. Check the operation of the magnetic clutch.8. When operating the magnetic clutch, check if the idlerpm is increasing.

9. Check the operating status of the condenser fanmotor.

Air-con Switch Condenser Fan Motor

ON ON

OFF OFF

10.Check whether the air-com normally operates.If the air-con is abnormal, check if the refrigerant isleak using a gas leakage detector.

Inspection before driving[D4GA engine]1. Check if the condenser pin is clogged or damaged.If the condenser pin is clogged, clean it with cleaner.

CAUTIONWhen cleaning the condenser pin, be careful notto damage it.

2. Check if the drive belt is properly installed in thepulley groove.

SUDHAA0001L

3. Crank the engine.4. Turn on the switch of the air conditioner.

NOTICECheck if the blower switch operates normally at eachposition.

5. Check the operation of the magnetic clutch.6. When operating the magnetic clutch, check if the idlerpm is increasing.

7. Check the operating status of the condenser fanmotor.

Air conditioner switch Condenser fan motor

ON ON

OFF OFF

8. Check whether the air conditioner normally operates.If the air conditioner is abnormal, check if therefrigerant is leak using a gas leakage detector.

SpecificationsItems Specifications

Heater unit Type Two-way flow pull air mixing system

Capacity 3,800±10% kcal/h

Heater control assembly Push & Rotary type

Heater case material P.P + TALC 20%

Heater case 2.0±0.2mm

Heater core type AL.TUBE & FIN CORRUGATE

Heater core size 163.5W x 185H x 27D

Door driving typ-e

Ventilation & Heater, hood door Motor actuator driving

Temperature door Cable driving

Output axis torque 4kgf.cm

Output axis RPM 4.0rpm

Output axis rotation direction Clockwise, Counter clockwise

Nominal voltage DC 24V

Output axis stall current Max. 300mA

Minimum operating voltage DC 20V

Nominal current Max. 125mA

Blower unit Blower unit case P.P + TALC 20%

Thickness of the blower unit case (mm) 1.8±0.2(Mando), 2.0±0.2(Dongwhan)

Blower fan type SIROCCO TYPE

Blower fan size 147 x 76.2 h

Blade number of the blower fan 44 EA

Blower motor Operation voltage DC 24V

No load velocity 3,400rpm(with Air-con), 3,200rpm(without Air-con)

Insulating resistance 1MΩ or more

Rotation direction Clockwise

Range of temperature -30°C~80°C

Items Specifications

Evaporator unit Materials P.P + TALC 20%

Core Type LAMINATED PLATE & C/FIN TYPE (1 TANK)

Size 223W x 220H x 940D(Dongwhan)216W x 211H x 780(Mando)

Fin pitch 2.1mm(Dongwhan), 1.82mm(Mando)

Expansion valve Type Block TXV Type

Stopping overheat(kgf/cm².G) 1.4±0.1 (0°C), 2.45±0.2(10°C) ; Dongwhan1.3±0.1(0°C), 1.5±0.1(0°C) in TCI ; Mando

Capacity 1.5RT

Resister Nominal voltage DC 24V

Range of using temperature -30°C~60°C

Range of operating temperature DC 20V ~ DC 30V

Short time HI-LO (sec) 240±40(Dongwhan), 285±40(Mando)

HI-ML (sec) 85±30(Dongwhan), 125±30(Mando)

HI-MI (sec) 40±20(Dongwhan), 65±20(Mando)

Air-con Refrigerant R-134a

Cooling capacity 3,400±10% kcal/h

Refrigerant capacity 625±20g(D4AE, D4AF, D4DC Engine)600±20g(D4AL, D4DA, D4DB Engine)570±20g[D4AL (NARROW)]425±20g(D4DD)500±20g(D4GA)

Compressor Type HS-17 swash plate (Except D4GA)HS-15 swash plate (D4GA)

Nominal voltage DC 24V

Energy consumption Max. 47W

Pulley type A-Type (140mm)

Max. RPM 7000 rpm

Frictional torque 4.4kgf.m Min.

Lubricant FD46XG oil (180±10cc)

Pressure reliefvalve

Operating pressure 35~42.2kg/cm².G

Release pressure Min. 28.1kg/cm².G

Items Specifications

Receiver dryer Materials AL 6061

Drying agent XH-9(50g) or the equivalent

Pressure for airtight test 36kgf/cm².G

Pressure for pressure test 54kgf/cm².G

Dual pressure s-witch High pressure switch OFF : 32kg/cm²±2

DIFF : 6kg/cm²±2

Low pressure switch ON : 2.0kg/cm²±0.2DIFF : 0.25kg/cm² Max.

Thermocon OFF : 1.0±0.5°C(Mando), 1.0°C(Dongwhan)

DIFF : 3.0±0.5°C(Mando), 1.5°C(Dongwhan)

Service StandardItem Nominal Value

Tension of the V-belt (After running) 6 ~ 9mm

Compressor Magnetic Clutch (Air Gap) 0.35 ~ 0.75mm (When the Magnetic Switch is OFF)

Tightening Torque[O-ring Jointing Part]

Outer Diameter of Pipe (m-m)

Tightening Torque

Nm kgf.m lb-ft

9 12~15 1.2~1.5 8.6~10.8

12.7 20~25 2.0~2.5 14.4~18.0

16 29~34 3.0~3.5 21.6~25.3

[Jointing Part of the FLAT Type Pipe]

Outer Diameter of Pipe(mm)

Tightening Torque

Nm kgf.m lb-ft

9 4~8 0.4~0.8 2.8~5.7

12.7 10~1520~29

1.0~1.52.0~3.0

7.2~10.814.4~21.6

16 20~29 2.0~3.0 14.4~21.6

[General Bolt and Nut]

Thread sizedia.x pitch

(mm)

Tightening Torque

4T 7T 8T 9T

Nm kgf.m lb-ft Nm kgf.m lb-ft Nm kgf.m lb-ft Nm kgf.m lb-ft

M5 x 0.8 3~4 0.3~0.4

2.1~2.8 5~6 0.5~

0.62.6~4.3 5~7 0.5~

0.73.6~5.0 - - -

M6 x 1.0 5~6 0.5~0.6

3.6~4.3 9~11 0.9~

1.16.5~7.9 8~12 0.8~

1.25.7~8.6 - - -

M7 x 1.26 12~16 1.2~1.6

8.6~11.5 20~25 2.0~

2.514.4~18.0 20~29 2.0~

3.014.4~21.6 - - -

M10 x 1.26 25~29 2.5~3.0

18.0~21.6 39~49 4.0~

5.028.9~36.1 44~59 4.5~

6.032.5~43.3

47~71

4.8~7.2

35~52.0

M10 x 1.5 18~26 1.8~2.7

13.0~19.5 32~49 3.3~

5.023.8~36.1 42~59 4.3~

6.031.1~43.3

44~67

4.5~6.8

32.5~49.1

M12 x 1.25 34~44 3.5~4.5

25.3~32.5 59~78 6.0~

8.043.3~57.8

83~108

8.5~11

61.4~79.5

85~128

8.7~13.1

62.9~94.7

M14 x 1.5 76~83 7.8~8.5

56.4~61.4

118~137

12~14

86.7~101.2

127~177

13~38

94.0~130.1 - - -

Heater and Air Conditioner Control SystemComponents[ LHD ]

SUDHAA0002L

1. Main Crash Pad2. Blower Assembly3. Facia Panel4. Intake Control Switch

5. Blower Switch6. Mode Switch7. Temperature Control Switch

[ RHD ]

SUDHAA0003L

1. Main Crash Pad2. Blower Assembly3. Facia Panel4. Intake Control Switch

5. Blower Switch6. Mode Switch7. Temperature Control Switch

Inspection1. Blower Switch

SUDHAA0004L

KVTH118A

KVTH119A

2. Air Intake Switch

EMTHA5025A

KVTH120A

KVTH121A

KVTH122A

EMTHA5027A

3. Temperature Control LeverSet the temperature control lever (B) of the controlassembly to the COOL position. Using the fixing keyof the heater unit Cable (A), fix the Cable firmly.

KVTH124A

4. Mode Actuator Switch

EMTHA5026A

KVTH125A

KVTH126A

Blower AssemblyComponents[ LHD ]

SUDHAA0005L

1. Blower Motor2. Joint Duct

3. Blower Assembly

[ RHD ]

SUDHAA0006L

1. Blower Motor2. Joint Duct

3. Blower Assembly

Inspection1. Check the air entrance/exit actuator.

SUDHAA0007L

KVTH128A

KVTH129A

SUDHAA0008L

SUDHAA0009L

2. Check the Blower Motor.1) Remove the blower motor connector.

KVTH130B

2) As shown in figure, connect the battery terminalsto the blower motor terminal. Check the revolutionstate of the blower motor.If the motor does not work, replace or repair theblower motor.

KVTH130A

3. Check the blower relay.(5 pins)

SUDHAA0010L

1) When an electric power is applied between thepower relay terminal No.85 and No.86, check thatthere is an electric current between the terminalNo.30 and No.87.

SUDHAA0011L

4. Check the relay.(4 pins)1) Remove the relay connector from the blower unit.

SUDHAA0012L

2) Check the electric current between the blowerrelay terminals.

EMTHA5029A

KVTH131A

5. Check the resistor.

SUDHAA0013L

1) Measure terminal-to-terminal resistance of theblower resistor.

2) If measured resistance is not within specification,the blower resistor must be replaced. (Afterremoving the resistor)

SUDHAA0014L

SUDHAA0015L

Heater AssemblyComponents[ LHD ]

SUDHAA0016L

1. Heater Unit2. Joint Duct

3. Blower Assembly

[ RHD ]

SUDHAA0017L

1. Heater Unit2. Joint Duct

3. Blower Assembly

Inspection1. Check the Mode Actuator

EMTHA5030A

2. After connecting the battery (-) terminal to the 1stterminal and the battery (+) terminal to the 2ndterminal, turn the switch to any position.If the actuator is not working, replace the actuator.

KVTH133B

KVTH133A

KVTH134A

3. When installing the heater hose (A), be ensure thatthe clamp (B) is tightened firmly.

KVTH135A

CAUTION1. When install the heater hose and pipe, be

careful that foreign material does not intrude,and the jointing portion between the hose andpipe does not have leakages.

2. Apply the liquid sealant at the jointing portionof the pipe and hose.

KVTH136A

Inspection (D4GA engine, RHD)1. Check the Mode Actuator

SUDHAA0020L

2. After connecting the battery (-) terminal to the 1stterminal and the battery (+) terminal to the 2ndterminal, turn the switch to any position.If the actuator is not working, replace the actuator.

KVTH133B

SUDHAA0019L

3. When installing the heater hose (A), be ensure thatthe clamp (B) is tightened firmly.

KVTH135A

CAUTION1. When install the heater hose and pipe, be

careful that foreign material does not intrude,and the jointing portion between the hose andpipe does not have leakages.

2. Apply the liquid sealant at the jointing portionof the pipe and hose.

KVTH136A

Air Conditioner AssemblyComponents

SUDHAA0021L

1. Evaporator assembly2. Compressor assembly3. Suction hose

4. Discharge hose5. Condenser assembly

Components(D4GA engine)

SUDHAA0022L

1. Evaporator assembly2. Compressor assembly3. Discharge hose4. Suction hose

5. Condenser assembly6. Liquid hose7. Radiator reservoir

CompressorComponents

SUDHAA0023L

1. Compressor Connector2. Magnetic Clutch

3. V-Belt4. Body

Components(D4GA engine)

SUDHAA0024L

1. Compressor body assembly1-1. Manifold assembly1-2. Wrench bolt2. Shaft seal assembly3. Retainer ring

4. Felt seal5. Field coil assembly6. Pulley assembly7. Retainer ring8. Spacer

9. Disc & hub assembly10. Hex flange head bolt11. Connector bracket12. Washer screw

Inspection1. Operation of Magnetic Clutch

1) Remove the connector from the magnetic clutch.2) Connect the battery (-) terminal to the magnetic

clutch connector and the battery (-) terminal tothe body.

3) If the magnetic clutch is normal, there is a "click"sound.If the pulley and the armature are not contacted(there is no "click" sound), the magnetic clutchhas been damaged.

KVTH137A

SUDHAA0025L

2. Check the magnetic clutch air gap.Using a thickness gauge, check the gap between theclutch hub and the pulley.When Magnetic Switch is OFF: 0.35~0.75mm

KVTH138A

SUDHAA0026L

Condenser Fan And MotorComponents

SUDHAA0027L

1. Condenser Fan 2. Fan Motor

Components (D4GA engine)

SUDHAA0028L

1. Condenser fan 2. Fan motor

Inspection1. Disconnect condenser fan motor connector(A).

EMTHA5032A

SUDHAA0029L

2. Inspection of the condenser fan motorAfter connecting the condenser pin connecter 1 to thebattery (+) terminal and the pin connector 2 to theground, check the motor operation

KVTH143A

Receiver DrierComponents

EMTHA5020A

Components (D4GA engine)

SUDHAA0030L

Inspection1. If there is a temperature difference between theentrance of the receiver drier and the exit of it, itmeans that the receiver drier is clogged.

KVTH145A

SUDHAA0031L

2. Check the high pressure switch and the low pressureswitch of the dual pressure switch.If they are not normally working, replace the dualpressure switch.

DualPressureSwitch

High PressureSwitch

OFF: 32kgf/cm²± 2DIFF: 6kgf/cm²± 2

Low PressureSwitch

ON: 2.0kgf/cm²± 0.2DIFF: 0.25kgf/cm²

Evaporator UnitComponents[ LHD ]

SUDHAA0032L

1. Joint Duct 2. Evaporate Unit

[ RHD ]

SUDHAA0033L

1. Joint Duct 2. Evaporate Unit

SUDHAA0034L

1. Evaporator Core Assembly2. Insulator Case Lower3. Evaporator Lower Air-conditioner Case

4. Evaporator Air-conditioner Resister5. Insulator Case Upper6. Evaporator Upper Air-conditioner Case

InspectionCheck for the Thermocon1. Turn on the Air-Con switch to start blower.2. Start the engine.3. After connecting the voltmeter to the connector NO.1and No.3 terminals of the switch, check that there isany variations on the voltage between the terminalsaccording to the surface temperature of theevaporator.

4. If the Thermocon switch is abnormal, remove theevaporator unit and replace the Thermocon switch.

OperatingTemperature

ThermoconSwitch

Operating-Temperature

TerminalVoltage

(1, 3)Remark

1.0 ± 0.5°C 1.0 ± 0.5°C 0V

Thecompressorclutch doesnot work.

3.0 ± 0.5°C 4.0 ± 0.5°C 24V or 12VThe

compressorclutch works.

KVTH148B

EMTHA5023A

Check the Resister1. Remove the resister connector from the evaporatorunit.

KVTH148C

2. Check the electrical current between the terminals ofthe resister connector.

EMTHA5031A

1) LO CheckCheck the resister value between the blowerresistor terminal No.1 and No.2

Resistor Value: 7.0Ω

2) ML CheckCheck the resistor value between the blowerresistor terminal No.1 and No.4.

Resistor Value: 2.94 Ω

3) MH CheckCheck the resistor value between the blowerresistor terminal No.1 and No.3.

Resistor Value: 0.9 Ω

[Resistor Connector]

SUDHAA0035L

[Circuit Diagram (24V)]

KVTH150A

Documents

Hyundai HD78 Heating, Ventilation & Air Conditioning