Hyundai Santa Fe (TM): Heating,Ventilation And Air Conditioning / Rear Heater

Hyundai Santa Fe (TM) 2019-2023 Service and Repair Manual / Heating,Ventilation And Air Conditioning / Rear Heater

Rear Heater Unit. Components and components location

Component Location

1. Rear Heater & A/C Unit

Components

1. Rear heater & blower unit assembly
2. Blower motor assembly
3. Rear power mosfet
4. Duct seal guide
5. Evaporator case [LH]
 6. Evaporator core assembly
7. Evaporator pipe assembly
8. Evaporator case [RH]
9. Evaporator lower case
10. Drain hose assembly

Rear Heater Unit. Repair procedures

Replacement
  
•
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.
(Refer to General Information - "Lift and Support Points")
1.
Disconnect the negative (-) battery terminal.
2.
Recover the refrigerant with a recovery/charging station.
3.
Remove the luggage side trim [RH]
(Refer to Body - "Luggage Side Trim")
4.
Loosen the mounting screws and separate the rear wheel guard [RH] (A).
5.
Loosen the mounting nuts and remove the refrigeration line (A).
Tightening torque :
8.8 - 13.7 N.m (0.9 - 1.4 kgf.m, 6.5 - 10.1 lb-ft)

  
•
Plug or cap the lines immediately after disconnecting them to avoid moisture and dust contamination.
6.
Loosen the rear evaporator pipe mounting bolts.
7.
Remove the mounting bolts and remove the rear A/C duct (A).
8.
Separate the rear blower motor connector (A) and rear mosfet connector (B).
9.
Loosen the mounting bolts and nuts and remove the A/C unit (A).
10.
Install in the reverse order of removal.

Rear Evaporator Core. Repair procedures

Replacement
1.
Remove the rear heater & A/C unit.
(Refer to Rear Heater - "Rear Heater Unit")
2.
Loosen the mounting screws and remove the rear A/C lower case (A).
3.
Remove the rear evaporator core (A).
4.
Install in the reverse order of removal.

Rear Blower Motor. Repair procedures

Replacement
1.
Disconnect the negative (-) battery terminal.
2.
Remove the luggage side trim [RH].
(Refer to Body - "Luggage Side Trim")
3.
Separate the blower motor connector (A) and loosen the mounting screws and remove the blower motor (B).
4.
Install in the reverse order of removal.

Rear Power Mosfet. Repair procedures

Inspection
1.
Turn the ignition switch ON.
2.
Manually operate the control switch and measure the voltage of the blower motor.
3.
Select the control switch to raise the voltage until it reaches high speed.

Specification
Fan
Motor Voltage
Manual
First speed
 3.8 ± 0.5V
Second speed
 5.0 ± 0.5V
Third speed
 6.2 ± 0.5V
Fourth speed
 7.4 ± 0.5V
Fifth speed
 8.6 ± 0.5V
Sixth speed
 9.8 ± 0.5V
Seventh speed
 11.0 ± 0.5V
Eighth speed
 Battery (+)

4.
If the measured voltage is not within specification, substitute with a known-good power mosfet and check for proper operation.
5.
Replace the power mosfet if it is proved that there is a problem with it.
Replacement
1.
Disconnect the negative (-) battery terminal.
2.
Remove the luggage side trim [RH].
(Refer to Body -"Luggage Side Trim")
3.
Separate the connector and loosen the mounting screw ,remove the power mosfet (A).
4.
Install in the reverse order of removal.

    Blower Unit. Components and components location Components Location 1. Blower unit assembly Components 1.

    Heater & A/C Control Unit (Manual). Components and components location Component Connector Pin Function Pin No Connector A Connector B 1 Battery Low 2 ISG B+ Common 3 ILL+ (TAIL) Ground 4 Sensor REF (+5V) Middle Low 5 Mode Actuator Feedback Middle High 6 Temperature Actuator Feedback High 7 Intake Actuator Feedback - 8 Evaporator Temperature Sensor (+) 9 Ambient Temperature Sensor (+) 10 Mode Actuator (Vent) 11 Mode Actuator (Defrost) 12 Temperature Control Actuator (Cool) 13 Temperature Control Actuator (Warm) 14 Intake Actuator (Fresh Air) 15 Intake Actuator (Recirculated Air) 16 HTD (Rear Defrost) 17 Rear Defogging Swich 18 Rear C-LINE 19 Blower Common Signal 20 ILL - (RHEO) 21 IGN2 22 IGN1 23 - 24 Rear Blower Motor (+) 25 Rear Mosfet (GATE) 26 Rear Mosfet (DRAIN F/B) 27 Max Blower on Signal 28 PTC Relay 2 (DIESEL) PTC Relay 1 (GASOLINE) 29 - 30 PTC ON Signal (DIESEL) - (GASOLINE) 31 - 32 - 33 P-CAN_(HIGH) 34 P-CAN_(LOW) 35 - 36 ECV (+) 37 ECV (-) 38 Sensor Ground 39 Ground 40 Ground Heater & A/C Control Unit (Manual).

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