SOURCE: How do you remove the dash to get to the heater
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SOURCE: how do i remove the
Sonata, Xg 300 And Xg 350
1. Before servicing the vehicle, refer to the Precautions section.
2. Disconnect the negative battery cable.
CAUTION
After disconnecting the negative battery cable, wait for at least 30 seconds for the SRS module to deplete its stored energy.
1. Drain the cooling system into a clean container for reuse.
2. Remove the heater hoses from the heater housing.
3. Discharge and recover the air conditioning system refrigerant.
4. Remove the suction and discharge hoses from the evaporator assembly. Cap the hoses to minimize contamination.
5. Remove the evaporator drain hose.
6. Remove the SRS module and the steering wheel by removing or disconnecting the following:
Steering wheel-to-SRS module nuts
SRS module from the steering wheel and disconnect the electrical connector
CAUTION
Store the SRS module in a safe place with the front facing upward.
Steering wheel-to-steering column nut
Steering wheel from the steering column
Fig. Instrument panel assembly-Sonata (clock over image for zoom)
Fig. Instrument panel screw locations-Sonata
1. Remove or disconnect the following:
Front and rear console assembly and remove both side covers
Glove box, the center pad cover, the center crash pad and the cassette assembly
Lower crash pad. Remove the console mounting bracket and the center support bracket
Rear heater ducts from the heater housing
Control assembly
Blower speed control actuator connector and the blend door actuator connector, if equipped with semi-automatic temperature control
4 retaining bolts and remove the heater assembly
2. Disassemble the heater housing by removing or disconnecting the following:
Vacuum motor-to-heater housing bolts (2 for each vacuum motor)
Vacuum motor rod end connection and remove the vacuum motors
Heater housing cover clips
Cover and the heater core
To install:
1. Install or connect the following:
Heater core and the cover
Heater housing cover clips
Vacuum motor rod end connection and install the vacuum motors
Vacuum motor-to-heater housing bolts (2 for each vacuum motor)
Heater assembly and attach it to the dash panel with the mounting bolts
Heater control assembly. Connect the ducts to the heater housing
Console mounting bracket and the center support bracket
Lower crash pad and both side covers
Front and rear console assembly
2. Install the SRS module and the steering wheel by installing or connecting the following:
Steering wheel to the steering column
Steering wheel-to-steering column nut and torque to 30-37 ft. lbs. (40-50 Nm)
SRS module to the steering wheel and connect the electrical connector
Steering wheel-to-SRS module nuts
Evaporator tubes, the heater hoses and the drain hose
3. Refill the cooling system.
4. Connect the negative battery cable.
5. Evacuate, charge and leak test the air conditioning system.
6. Operate the engine to normal operating temperatures; then, check the climate control operation and check for leaks.
Hope helps.
The heater housing is disassembled to get to the heater core.
Heater Core
The heater housing is disassembled to get to the heater core.
Heater Core 
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