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Home >> Genesis >> 2020 >> G80 5.0 Ultimate, AWD >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Heater System >> Heater Unit >> Repair Procedures >> Replacement

Repair Procedures: Replacement

  1. Disconnect the negative (-) battery terminal.
  2. Recover the refrigerant with a recovery/recycling/charging station.
  3. When the engine cools down, drain the engine coolant from the radiator.

    (Refer to Engine Mechanical System - "COOLANT ")

  4. Remove the cowl top cover.

    (Refer to Body - "COWL TOP COVER ")

  5. Remove the bolts and the expansion valve (A) from the evaporator core.
    G12662464Courtesy of HYUNDAI MOTOR AMERICA
    NOTE:
    • Plug or cap the lines immediately after disconnecting them to avoid the intrusion of moisture and dust.
    • When installing, replace with a new O-ring.
  6. Disconnect the inlet (A) and outlet (B) heater hoses from the heater unit.
    G12662465Courtesy of HYUNDAI MOTOR AMERICA
    CAUTION:
    • Engine coolant will run out when the hoses are disconnected; drain it into a clean drip pan. Be sure not to let coolant spill on electrical parts or painted surfaces. If any coolant spills, rinse it off immediately.
  7. Loosen the cowl cross member mounting bolts.
    G12662466Courtesy of HYUNDAI MOTOR AMERICA
  8. Remove the front seat assembly.

    (Refer to Body - "FRONT SEAT ASSEMBLY ")

  9. Remove the main crash pad.

    (Refer to Body - "MAIN CRASH PAD ")

  10. Disconnect the steering column connectors.

    (Refer to Steering System - "STEERING COLUMN AND SHAFT ")

  11. Pull down the steering column after loosening the mounting bolts and through bolts.

    (Refer to Steering System - "STEERING COLUMN AND SHAFT ")

  12. Remove the shift lever assembly.

    (Refer to Automatic Transaxle System - "SHIFT LEVER ")

  13. Disconnect the airbag control module (SRSCM) connector (A).
    G12662467Courtesy of HYUNDAI MOTOR AMERICA
  14. Disconnect the junction box connectors (A).
    G12662468Courtesy of HYUNDAI MOTOR AMERICA
  15. Disconnect the multi box connectors (A).

    [Driver"s side] 

    G12662469Courtesy of HYUNDAI MOTOR AMERICA

    [Passenger"s Side] 

    G12662470Courtesy of HYUNDAI MOTOR AMERICA
  16. Disconnect the connectors (A) and the mounting clips in the front pillar.

    [Driver"s Side] 

    G12662471Courtesy of HYUNDAI MOTOR AMERICA

    [Passenger"s Side] 

    G12662472Courtesy of HYUNDAI MOTOR AMERICA
  17. After loosening the bolts, remove the main crash pad and cowl cross bar assembly (A) together.
    G12662473Courtesy of HYUNDAI MOTOR AMERICA
  18. Separate the blower unit (A) from the heater unit (B) after loosening the screws.
    G12662474Courtesy of HYUNDAI MOTOR AMERICA
    G12662475Courtesy of HYUNDAI MOTOR AMERICA
    G12662476Courtesy of HYUNDAI MOTOR AMERICA
  19. After loosening the screws, remove the heater core cover (A).
    G12662477Courtesy of HYUNDAI MOTOR AMERICA
  20. Pull out the heater core (A) from the heater unit.
    G12662478Courtesy of HYUNDAI MOTOR AMERICA
  21. Loosen the heater lower case mounting screws.
    G12662479Courtesy of HYUNDAI MOTOR AMERICA
    G12662480Courtesy of HYUNDAI MOTOR AMERICA
    G12662481Courtesy of HYUNDAI MOTOR AMERICA
    G12662482Courtesy of HYUNDAI MOTOR AMERICA
  22. Remove the lower case (A).
    G12662483Courtesy of HYUNDAI MOTOR AMERICA
  23. Pull out the evaporator core (A) from the heater unit.
    G12662484Courtesy of HYUNDAI MOTOR AMERICA
    NOTE:
    • Be careful that the inlet and outlet pipe are not bent during evaporator core removal/installation.
  24. Install in the reverse order of removal.

    Information 

    • If you"re installing a new evaporator core, add compressor oil (PAG OIL).
    • Replace the O-rings with new ones at each fitting, and apply a thin coat of refrigerant oil before installing them. Be sure to use the right O-rings for R-1234yf to avoid leakage.
    • Immediately after using the oil, replace the cap on the container, and seal it to avoid moisture absorption.
    • Do not spill the refrigerant oil on the vehicle; it may damage the paint; if the refrigerant oil contacts the paint, wash it off immediately.
    • Apply sealant to the grommets.
    • Make sure that there is no air leakage.
    • Charge the system and test its performance.
    • Do not interchange the inlet and outlet heater hoses and tighten the hose clamps firmly.
    • Refill the cooling system with engine coolant.
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