Leak Detection Additive, Adding with Refrigerant Circuit Charged

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NOTE:

Pay attention to the following if leak detection fluid has already been poured into a refrigerant circuit in the course of previous repair work: Only add new leak detection fluid if refrigerant oil is replaced. If only some of the refrigerant oil has been replaced, just add the corresponding quantity of leak detection fluid. If, for example, 100 ml of refrigerant oil has been replaced on a vehicle containing 250 ml, only add 1 ml (cm ³ ) of leak detection additive.
A small quantity of leak detection additive remains in the service connection. This is to be carefully removed so as to avoid subsequent erroneous leak detection.
The air conditioner must be operated for at least 60 min. to distribute the additive throughout the refrigerant circuit (compressor must run). Depending on the magnitude and location, it may take several days for sufficient refrigerant oil and additive to emerge to clearly identify the leak.

Fig 1: Identifying Cartridge & One Unit

Courtesy of VOLKSWAGEN UNITED STATES, INC.

The cartridge - A - contains 15.4 ml of leak detection additive (one unit - B - corresponds to 2.5 ml).

Switch off ignition.

Remove cap from service connection on low-pressure side of refrigerant circuit.

Fig 2: Assembling Hand Pump VAS 6201 With Cartridge - VAS 6201/2

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Assemble hand pump VAS 6201 , item - 1 - with cartridge, item - 2 - VAS 6201/2.

Insert tube VAS 6201/8 ( → VAS 6201/8 item - 7 - ) in service coupling and open service coupling by screwing in handwheel. Hold hose upwards and screw in toggle of hand pump until leak detection additive starts to emerge from tube.

NOTE:

Make sure hand pump hose is completely filled with refrigerant.
Close service coupling and remove tube from locking mechanism.

Fig 3: Inserting Tube VAS 6201/8 In Service Coupling

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Cover area around service connection on vehicle with sheeting or absorbent paper.

Connect filler unit to refrigerant circuit service connection on vehicle.

Open service connection by screwing in handwheel.

Screw in toggle of hand pump to transfer 2.5 ⁺ /- 0.5 ml (milliliter= cm ³ ) of leak detection additive to refrigerant circuit.

Fig 4: Identifying Leak Detection Fluid Added Sticker

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Disconnect filler unit from service connection.

Use absorbent paper, for example, to remove remnants of leak detection additive from service connection.

Seal service connection with cap.

If necessary, use cleaning agent to clean area around service connection.

Affix sticker next to service connections to indicate that leak detection fluid has been added to the refrigerant circuit.