Hyundai Tucson: External Control Valve Compressor Inspection (GDS)

Hyundai Tucson - Fourth generation (NX4) - (2020-2023) - Workshop Manual / Heating, Ventilation and Air Conditioning (HVAC) / Air Conditioning System / 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)'


  1. Make the vehicle ready as the GDS instruction on the monitor. (Turn off A/C 'switch' only)

  1. Check if other DTC codes are found before inspect 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

  1. Start inspection



Check if condenser fan is operating when condition is changed to 'ECV running'


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
  1. Check the result of inspection.




  1. If the result shows "Check", click "Check" and follow the instruction.

  1. Inspect ECV again from the first step.


     Compressor - Disassembly

    Disassembly Remove the front tire RH. (Refer to Suspension System - "Wheel") Loosen the drive belt. (Refer to Engine Mechanical System - "Drive Belt") Remove the clutch bolt (A) while holding the pulley with a clutch b


    Components Location Condensor Inspection Check the condenser fins for clogging and damage. If clogged, clean them with water, and blow them with compressed air. If bent, gently bend them using a screwdriver or pliers. Check the co

     Condensor - Replacement

    Remove the condensor. (Refer to Air conditioning System - "Condensor") Using a Lwrench, remove the cap (A) on the bottom of the receiver-drier. Remove the receiver-drier (A) from condenser using a long nose plier. Check


     Winter precautions

    Use high quality ethylene glycol coolant Your vehicle is delivered with high quality ethylene glycol coolant in the cooling system. It is the only type of coolant that should be used because it helps prevent corrosion in the cooling system, lub

     Airbag Module - Removal

    Removal Set the front tires straight-ahead. Disconnect the batteiy negative terminal. WARNING After disconnecting the cables, wait at least 3 minutes. Put a flat tool (05mm) into a guide hole located in the left/right of steering whe