| SONATA(YF) >2013 > G 2.4 GDI > Heating,Ventilation, Air Conditioning > Heater > Heater Unit>Repair procedures |

Replacement

1. | Disconnect the negative (-) battery terminal.

2. | Recover the refrigerant with a recovery/ recycling/ charging station.

3. | When the engine is cool, drain the engine coolant from the radiator.

4. | Remove the expansion valve cover (A).

5. | Remove the bolts (A) and the expansion valve (B) from the evaporator core. Plug or cap the lines immediately after disconnecting them to avoid moisture and dust contamination.

Tightening torque :
7.8 ~ 11.7 N.m ( 0.8 ~ 1.2 kgf.m, 5.7 ~ 8.6 Ib-ft)

6. | Disconnect the inlet (C) and outlet (D) heater hoses from the heater unit.

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. | Remove the crash pad. (Refer to BD group - "Crash Pad")

8. | Disconnect the connectors from the temperature control actuator, the mode control actuator and the evaporator temperature sensor.

9. | Remove the cowl cross bar assembly. (Refer to BD group - "Cowl Cross Bar")

10. | Remove the heater & blower unit (A) after loosening 3 mounting bolts.

11. | Remove the blower unit (A) from heater unit after loosening 3 screws.

12. | Loosen the mounting screw and then remove the heater core cover (A).

13. | Remove the heater core (A) from heater unit.

14. | Loosen the heater unit lower case mount screw and then remove the heater unit lower case (A).

15. | Remove the evaporator core (A).

16. | Be careful that the inlet and outlet pipe are not bent during heater core removal, and pull out the heater core.

17. | Installation is the reverse order of removal.

18. | Installation is the reverse order of removal, and note these items :

A. | If you're installing a new evaporator, add refrigerant oil (ND-OIL8).

B. | 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-134a to avoid leakage.

C. | Immediately after using the oil, replace the cap on the container, and seal it to avoid moisture absorption.

D. | 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

E. | Apply sealant to the grommets.

F. | Make sure that there is no air leakage.

G. | Charge the system and test its performance.

H. | Do not interchange the inlet and outlet heater hoses and install the hose clamps securely.

I. | Refill the cooling system with engine coolant