Hyundai Sonata: Heater / Heater Core Repair procedures
| 1. |
Disconnect the negative (-) battery terminal. |
| 2. |
After loosening the bolts remove the main crash pad and cowl cross bar assembly together.
(Refer to Heater -"Heater Unit") |
| 3. |
Remove the heater core cover (A) after loosening the mounting screws. 
|
| 4. |
Pull out the heater core (A) from the heater unit. 
|
| 5. |
Install in the reverse order of removal.
| A. |
If you're installing a new heater core, add refrigerant oil (PAG OIL). |
| 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. |
|
Replacement
When prying with a flat-tip screwdriver or use a prying trim
tool, wrap it with protective tape, and apply protective tape around the
related parts, to prevent ...
Replacement
1.
Disconnect the negative (-) battery terminal.
2.
After loosening the bolts remove the main crash pad and cowl cross bar assembly together.
(Refer to Heater -"Heater Unit")
...
Heater Unit Repair procedures
Evaporator Core Repair procedures