Hyundai Sonata LF: 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 damage...
Replacement
1.
Disconnect the negative (-) battery terminal.
2.
After loosening the bolts remove the main crash pad and cowl cross bar assembly together...
Other information:
Removal
•
In order to remove the rear glass, use the tools shown in the following figure:
[Tooling Diagram]
Square wire
Insert-type wire grip
[Tooling Assembly Diagram]
•
Insert and affix square wire into the insert hole of the wire grip ...
Compession Pressure Inspection
If the there is lack of power, excessive oil consumption or poor fuel economy, measure the compression pressure.
1.
Make sure the oil in the crankcase is of the correct
viscosity and at the correct level and that the battery is correctly
charged...
Heater Unit Repair procedures
Evaporator Core Repair procedures