Leak Detection On Refrigerant Circuit Using Leak Detection System Vas 6201
Special tools and workshop equipment required
- Leak Detection System VAS 6201
- Hand Pump With Low Pressure Hose VAS 6201/1
- Cartridge VAS 6201/2
- Cleaning Agent VAS 6201/3
- UV Leak Detection Lamp VAS 6201/4
- UV-Absorbing Safety Goggles VAS 6201/6
- Sticker VAS 6201/7
- Filler Tube -- VAS 6201/8
- Protective Gloves VAS 6201/9
Vehicles with a high voltage system (hybrid vehicles)
Read and follow all of the supplemental warnings for all work performed on vehicles with the high voltage system. Refer to HYBRID VEHICLE HIGH VOLTAGE SYSTEM PROCEDURES .
All vehicles
Certain leaks cannot or only with difficulty be found using an electric leak detection unit. Leak detection can be performed using leak detection system VAS 6201 for determining these leaks.
Refrigerant and refrigerant oil escape when there is a leak in the refrigerant circuit. Generally, this oil remains in the vicinity of the leaking area. A small amount of fluorescent fluid must be added into refrigerant circuit so that this oil becomes visible under UV light. This fluid (PAG oil with an additive that lights up under UV light) is added into the refrigerant circuit and distributes itself with the refrigerant oil when the A/C system is switched on.
A/C system must be operated for a minimum of 60 min. so that the additive distributes itself in the entire refrigerant circuit (compressor must be running). Depending on the size of the leak, it may become visible under UV light within that time.
Refrigerant oil with additive that lights up under UV-light can be added directly with an open circuit or be pumped into a filled circuit via service connection on the low pressure side using hand pump VAS6201/1 (from leak detection system VAS 6201).
If the leak detection additive is added to a filled refrigerant circuit via service connection on the low pressure side, a small amount of a UV-leak detection additive remains in the service connection. Carefully remove this residual amount so a leaking area is not detected erroneously upon a later leak detection.
If a component in which UV-leak detection additive has been added is being replaced on a circuit, always clean connection areas to other components thoroughly after assembling refrigerant circuit. This UV-leak detection additive residue may occur erroneously as leaking areas during later leak detection.
Refrigerant oil and with it UV-leak detection additive reaches into service station when evacuating a refrigerant circuit. Refrigerant oil is separated from refrigerant in oil collector of service station and removed from service station via draining device. The refrigerant oil drained off must not be poured back in. It must be replaced with new refrigerant oil.
If leak detection fluid was filled already in a refrigerant circuit for an earlier repair, note the following: only add new leak detection additive if the refrigerant oil will be replaced. If only a portion of refrigerant oil was replaced, only top-off with a corresponding amount of leak detection fluid as well. For example, if 100 ml of refrigerant oil was replaced in a vehicle with 250 ml, add only 1 ml (cm3 ) of UV-leak detection additive.
Certain materials and their connections (for example, oxidation products on aluminum components, corrosion protection growth, etc.) also light up under UV-light.
Depending on the version of the A/C Service Station, stop UV-leak additive can also be added directly at the top. Refer to the Operating Instructions that come with the A/C Service Station.
To prevent more refrigerant than is necessary for the leak test from venting into the air, proceed as follows with the refrigerant circuit completely empty
-- Evacuate the refrigerant circuit with the A/C service station. Refer to EVACUATING REFRIGERANT CIRCUIT .
If a larger leak is found during evacuation, find and it and repair it as described. Refer to FINDING LEAKS USING VACUUM TEST WITH A/C SERVICE STATION OR WITH NITROGEN PRESSURE TESTING and EVACUATING REFRIGERANT CIRCUIT .
The UV-leak detection additive can also be filled in a filled or open refrigerant circuit with the VAS 6201, refer to LEAK DETECTION ON REFRIGERANT CIRCUIT USING LEAK DETECTION SYSTEM VAS 6201 .
If no leak is found during evacuation or there is a leak that is so small that the location cannot be found, proceed as follows.
- Fill the UV-leak detection additive with the A/C Service Station in the refrigerant circuit, refer to FILL THE UV-LEAK DETECTION ADDITIVE WITH THE A/C SERVICE STATION IN THE REFRIGERANT CIRCUIT .
- Add UV-leak detection additive using the VAS 6201 in the refrigerant circuit LEAK DETECTION ON REFRIGERANT CIRCUIT USING LEAK DETECTION SYSTEM VAS 6201 .