Hyundai Creta: 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 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 improvees driving comfort.
ECV Control Diagram

Components and components location

Components
[Gamma Engine]

1. Clutch Bolt
2. Limiter Bolt
3. Limiter & Hub Assembly
4. Snap Ring
5. Pulley
6. Compressor Assembly
7. Electric Control Valve (ECV)

[U2 Engine]

1. Clutch Bolt
2. Limiter Bolt
3. Limiter & Hub Assembly
4. Snap Ring
5. Pulley
6. Compressor Assembly
7. Electric Control Valve (ECV)

Components Location

1. Comperssor


Repair procedures

Removal
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.
2.
Disconnect the negative (-) battery terminal.
3.
Recover the refrigerant with a recovery/charging station.
4.
Remove the engine room cover.
(Refer to Engine Mechanical System - " Engine Room Cover")
5.
Loosen the drive belt.
(Refer to Engine Mechanical System - " Drive Belt")
6.
Remove the bolts, then disconnect the suction line (A) and discharge line (B) from the compressor.
Tightening torque :
18.6 ~ 27.5 N.m (1.9 ~ 2.8 kgf.m, 13.7 ~ 20.3 Ib-ft)
  
Plug or cap the lines immediately after disconnecting them to avoid the intrusion of moisture and dust.

7.
Disconnect the compressor switch connector (A).

8.
Remove the compressor (A) by loosening the mounting bolts.
Tightening torque :
20.0 ~ 32.95 N.m (2.04 ~ 3.36 kgf.m, 14.75 ~ 24.30 Ib-ft)

Installation
1.
Make sure the compressor (A) mounting bolt with the correct length is screwed in. Tighten the mounting bolts in the specified tightening order.
Tightening torque :
20.0 ~ 32.95 N.m (2.04 ~ 3.36 kgf.m, 14.75 ~ 24.30 Ib-ft)
[Gamma Engine]

[U2 Engine]

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 the 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 to avoid leakage.
To avoid contamination, do not return the oil to the container once dispensed, and never mix it with other types refrigerant oil.
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 (A) for discoloration, peeling or other damage. If there is damage, replace the assembly.
2.
Check the pulley (B) 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.

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 because 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]

2.
Make the vehicle ready according to the GDS instruction on the monitor. (Turn off A/C 'switch' only)
[ECV2]

[ECV3]

3.
Check if other DTC codes are found before inspecting ECV compressor. If so, solve that problems first. If not, press 'OK' button to continue.
  
Do not continue inspection if these DTC codes are found: B1241, B1242, B1672, B1685, B1686, B1687
[ECV4]

4.
Start inspection
[ECV5]

[ECV6]

  
Check if condenser fan is operating when condition is changed to 'ECV running'
  
Relief valve will be operated if a condenser fan doesn't work because of overpressure in the compressor. It helps the air conditioning system to be stabilized by releasing refrigerant and oil. (To be closed if stabilized.)
※ Refill refrigerant and oil after operation of relief valve
※ Noise occurs when Relife valve is in operation.
5.
Check the result of inspection and click 'Check Detail' if it's 'Check'. Follow the instruction and inspect ECV again from the first step.
[ECV7]

[ECV8]

Disassembly
1.
Loosen the drive belt.
(Refer to Engine Mechanical System - " Drive Belt")
2.
Remove the clutch bolt (A) while holding the pulley with a clutch bolt remover (09977-3R000).
Tightening torque :
10.0 ~ 15.0 N.m (1.02 ~ 1.53 kgf.m, 7.37 ~ 11.0 lb-ft)

3.
Loossen the limiter bolts and then remove the limiter & hub assembly.

4.
Remove the pulley (B) after removing the snap ring (A) with a snap ring plier.

  
Be careful not to damage the pulley and compressor during disassembly/reassembly.
Once the snap ring is removed, replace it with a new one.
5.
Reassemble in the reverse order of disassembly.
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.
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