Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Fill The UV-Leak Detection Additive With The A/C Service Station In The Refrigerant Circuit
-- Add UV-leak detection additive and in the designated quantities using the A/C Service Station in the refrigerant circuit. Refer to REFRIGERANT R134A CAPACITIESΒ .
Add 2.5 + /- 0.5 cm 3 of UV-leak detection additive for a refrigerant circuit with a refrigerant capacity of 100 to 150 cm 3 with the - VAS 6201/1- for the VAS 6201. If the refrigerant oil capacity in the refrigerant circuit is greater, more UV-leak detection additive must be added (that is 5.0 + /- 0.5 cm3 for a refrigerant circuit with a refrigerant oil capacity of 250cm 3 . When adding the UV-leak detection additive with the A/C Service Station, consult the corresponding Owner's Manual as the required amount may vary. For the respective refrigerant oil quantities in the refrigerant circuit, refer to REFRIGERANT OIL CAPACITIESΒ .
-- Apply a label near the service connection stating that UV-leak detection additive was added to the refrigerant circuit.
-- Start the A/C system.
A/C system must be operated for a minimum of 60 minutes 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.
Depending on the size and location of the leak, it can now last up to several days until enough refrigerant oil with UV-leak detection additive flows out to determine definitely the leaking area.
-- Find the leak in the refrigerant circuit with the UV lamp VAS 6196/4 DETECTING LEAKS ON REFRIGERANT CIRCUIT USING UV LAMP VAS 6196/4Β .
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.