Renault Koleos Service Repair Manual: Coolant circuit check

IMPORTANT To avoid all risk of damage to the systems, apply the safety and cleanliness instructions and operation recommendations before carrying out any repair (see 62A, Air conditioning, Air conditioning: Precautions for repair, page 62A-1) .

Fault finding for detecting leaks:

Component Detection area Part to be replaced after first check Part to be replaced after filling and second check
Condenser Inlet or outlet Pipe Condenser
Evaporator Connection flange Pipe Connection flange and/or evaporator
Compressor Inlet or outlet Pipes Compressor


Note: Check for leaks using the electronic detector first before using the trace detector.
  • This device measures variations in the quantity of refrigerant in the air and beeps accordingly.
  • The device must be initialised before checking.

    To do this:

    • immobilise the device,
    • calibrate the device in the engine compartment,
    • do not start the engine.
  • This point is then used as standard for detecting the contamination rate.

    This device is highly sensitive: during the detection process, only follow the line of the circuit as closely as possible to limit variations caused by other gases.

    This device only detects relatively substantial leaks.

Note: Make sure that the sensor at the end of the rod is extremely clean and in good condition.


WARNING After injecting dye into the refrigerant, be sure to indicate this on a label (supplied with the dye capsule), and the date of the operation.

Position the label so it is visible near to the cold loop filler valve.

  • Detecting leaks using a tracer involves adding a dye to the refrigerant, and locating the points of loss using an ultraviolet light.
Note: The procedure described must be observed.


Note: Use this leak detection method as a last resort for leaks that cannot be located.

Air conditioning

  • The procedure for detecting refrigerant leaks uses a dye which is available as a single-use capsule (1) : traces of fluid are detected using an ultraviolet lamp (2) .
  • The dye remains in the air conditioning system.
  • It is possible to check the status of the cold loop using the ultraviolet lamp, without injecting the dye again.
WARNING To avoid damaging the cold loop components (corrosions, etc.), do not use dye if the traces reveal that some product has already been injected.
  • If there is nothing to indicate that dye has been used previously (label, etc.):
    • position a cloth,
    • release a small jet of refrigerant through the two valves,
    • light up the valve interior using the ultraviolet lamp,
    • check for fluorescent traces.
  • Add a dose of detection dye if there are no fluorescent traces or label.
  • Affix a label.
  • Record the date when the dye was added.

1 - Injecting dye into the circuit

Air conditioning

  • For vehicles with a single valve, set up the dye injection system on the low pressure valve by following the circulation direction of the product and using the union (3) .
  • Inject the dye into the circuit.
  • Run the air conditioning system for approximately 15 minutes.

2 - Leak detection procedure

  • Carry out an initial check (with the engine stopped) by sweeping the circuit with an ultraviolet light.
Note: Use an adjustable mirror wherever access is difficult.
  • If no leak is apparent:
    • carefully clean the coolant circuit on the outside,
    • run the air conditioning system until the leak is detected (failing this, check the condition of the evaporator).
WARNING After injecting dye into the refrigerant, be sure to indicate this on a label (supplied with the dye capsule), and the date of the operation.

Position the label so it is visible near to the cold loop filler valve.

    Air conditioning: Check

    Coolant circuit Draining - Refilling

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