Hyundai Palisade (LX2): Air conditioning System / Compressor

Hyundai Palisade (LX2) 2020-2025 Service Manual / Heating,Ventilation And Air Conditioning / Air conditioning System / Compressor

Description and operation

Description
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 internally controlled variable swash plate compressor changes the swash plate angle by a MCV (Mechanical Control Valve) in accordance with fluctuation of a suction pressure.
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

Hyundai Palisade. Description and operation

Components and components location

Components
[R Engine]

Hyundai Palisade. Components and components location

1. Clutch bolt
2. Disc & Hub assembly
3. Snap ring
4. Pulley
 5. Clutch magnetic coil
6. Compressor
7. ECV Snap ring
8. Electric Control Valve (ECV)

[LAMDA Engine]

Hyundai Palisade. Components and components location

1. Clutch bolt
2. Disc & Hub assembly
3. Clutch hub spacer
4. Snap ring
5. Pulley
 6. Clutch magnetic coil
7. Compressor
8. ECV Snap ring
9. Electric Control Valve (ECV)

Repair procedures

Removal
1.
If a compressor is available, the air conditioner is operated for a few minutes in the engine idle state and then the engine is stopped.
2.
Disconnect the negative (-) battery terminal.
3.
Recover the refrigerant with a recovery/charging station.
4.
Loosen the drive belt.
(Refer to Engine Mechanical System - "Drive Belt")
5.
Loosen the mounting nuts and separate the suction line (A), discharge line (B).
Tightening torque :
20.9 - 31.2 N.m (2.1 - 3.2 kgf.m, 15.4 - 23.0 lb-ft)
Hyundai Palisade. Repair procedures   
•
Plug or cap the lines immediately after disconnecting them to avoid moisture and dust contamination.

Hyundai Palisade. Repair procedures
6.
Press the lock pin and separate the ECV connector (A).

Hyundai Palisade. Repair procedures
7.
Loosen the mounting bolts and remove the compressor assembly (A).
Tightening torque :
19.6 - 33.3 N.m (2.0 - 3.4 kgf.m, 14.8 - 24.6 lb-ft)

Hyundai Palisade. Repair procedures
Installation
1.
Make sure that the compressor (A) mounting bolt of the correct length is screwed in. Tighten the mounting bolts in the specified tightening order.
Tightening torque :
19.6 - 33.3 N.m (2.0 - 3.4 kgf.m, 14.8 - 24.6 lb-ft)
[R Engine]

Hyundai Palisade. Repair procedures

[LAMDA Engine]

Hyundai Palisade. Repair procedures
2.
Install in the reverse order of removal.
•
If you install a new compressor, drain all the refrigerant oil from the removed compressor and measure its volume. Subtract the volume of drained oil from the original capacity. The result is the amount of oilcompressor oil you should drain from the new compressor (through the suction fitting).
•
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, R-1234yf to avoid leakage.
•
To avoid contamination, do not return the oil to the container once dispensed, and never mix it with other refrigerant oils.
•
Immediately after using the oil, replace the cap on the container and seal it to avoid moisture absorption.
Inspection
1.
Check the plated parts of the limiter & hub assembly for color changes, peeling or other damage. If there is damage, replace the assembly.
2.
Check the pulley (A) bearing play and drag by rotating the pulley by hand. Replace the pulley with a new one if it is noisy or has excessive play / drag.

Hyundai Palisade. Repair procedures
External Control Valve Compressor Inspection (GDS)
Compressor type: Fixed type compressor, External control valve, Internal control valve.
In cases of fixed type and internal control valve, it is possible to inspect compressor's operation with clutch noise.
When it comes to External control valve, however, it cannot be checked in this way bacause it doesn't have a clutch.
So, ECV should be inspected with GDS as below.
1.
Connect GDS to the vehicle and select 'Aircon Compressor Test(ECV type)'
[ECV1]

Hyundai Palisade. Repair procedures
2.
Make the vehicle ready as the GDS instruction on the monitor. (Turn off A/C 'switch' only)

Hyundai Palisade. Repair procedures
3.
Check if other DTC codes are found before inspect ECV compressor. If so, solve that problems first. If not, press 'OK' button to continue.
Hyundai Palisade. Repair procedures   
Do not continue inspection if these DTC codes are found: B1241, B1242, B1672, B1685, B1686, B1687

Hyundai Palisade. Repair procedures
4.
Start inspection

Hyundai Palisade. Repair procedures

Hyundai Palisade. Repair procedures

Hyundai Palisade. Repair procedures   
Check if condenser fan is operating when condition is changed to 'ECV running'
Hyundai Palisade. Repair procedures   
Relief valve will operate if condenser fandoesn't work due to overpressure in thecompressor. It helps the airconditiong system torelieve by releasing refrigerant and oil (losed ifrelieved).
※ Refill refrigerant and oil after operation of relief valve
※ Noise occurred when relief valve is in operation
5.
Check the result of inspection.
[ECV7]

Hyundai Palisade. Repair procedures

[ECV8]

Hyundai Palisade. Repair procedures
6.
If the result shows "Check" , click "Check" and follow the instruction.

Hyundai Palisade. Repair procedures
7.
Inspect ECV again from the first step.
Disassembly
1.
Remove the front tire [RH].
2.
Loosen the drive belt.
(Refer to Engine Mechanical System - "Drive Belt")
3.
Remove the clutch bolt (A) while holding the pulley with a clutch bolt remover (09977-3R000).
Tightening torque :
15.0 - 21.0 N.m (1.53 - 2.14 kgf.m , 11.1 - 15.5 lb - ft)

Hyundai Palisade. Repair procedures
4.
Loossen the limiter bolts and then remove the limiter & hub assembly.

Hyundai Palisade. Repair procedures
5.
Remove the pulley (B) after removing the snap ring (A) with a snap ring plier.

Hyundai Palisade. Repair procedures

Hyundai Palisade. Repair procedures

Hyundai Palisade. Repair procedures   
•
Be careful not to damage the pulley and compressor during disassembly/reassembly.
•
Once the snap ring is removed, replace it with a new one.
6.
Reassemble in the reverse order of disassembly.
Hyundai Palisade. Repair procedures   
•
Clean the pulley and compressor sliding surfaces with non-petroleum solvent.
•
Install a new snap ring, and make sure they are fully seated in the groove.
•
Make sure that the pulley turns smoothly after reassembly.

    Components and components location Components [Isometric view] 1. Front suction & Liquid pipe assembly [Top view] 1.

    Components and components location Components Location 1. Condensor

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