Hyundai Sonata LF: Air Conditioning System / Compressor Description and Operation
The compressor is the power unit of the A/C system.
It is located on the side of engine block and driven by a V-belt of the engine.
The compressor changes low pressure and low temperature refrigerant gas into high pressure and high temperature refrigerant gas.
Variable Swash Plate Compressor
The compressor has a swash plate that rotates to reciprocate pistons, which compress refrigerant.
The variable swash plate compressor controls the swash plate
angle to change the refrigerant displacement. It achieves precise
cooling capability control in accordance with vehicle interior and
driving conditions.
The externally controlled variable swash plate compressor
changes the swash plate angle by an ECV (Electric Control Valve) in
accordance with an electrical signal from the heater & A/C control
unit.
This enables stable temperature control and improved driving sensation.
ECV Control Diagram

Replacement
1.
If the compressor is marginally operable, run the engine at
idle speed, and let the air conditioning work for a few minutes, then
shut the engine off...
Other information:
Removal
1.
Disconnect a boots from the console upper cover.
2.
Pull the knob (A) in the direction of "F" and remove the knob.
3.
Remove the floor console assembly.
(Refer to Body - "Floor Console")
4.
Disconnect the connector (A) from the shift lever...
Precautions
General Precautions
Please read the following precautions carefully before performing the airbag system service.
Observe the instructions described in this manual, or the airbags could accidentally deploy and cause damage or injuries...