Leaks, Finding Using Forming Gas
Special tools and workshop equipment required
- Pressure Regulator R134A & R1234yf:VAS 584 007
- Gas Leak Detector:VAS 523 003
- Forming Gas Cylinder 95/5, commercially available according to DIN EN ISO 14175
Procedure
- Refrigerant circuit is completely assembled.
- Refrigerant circuit is completely evacuated.
-- If possible, evacuate the refrigerant circuit. Refer to REFRIGERANT CIRCUIT, EVACUATING .
Vehicles with electrical A/C compressor
Extremely dangerous due to high-voltage.
Electrocution can cause death or very serious personal injury.
- Have the high-voltage system de-energized by a qualified person.
-- De-energize the high-voltage system. Refer to the appropriate Service Information .
Vehicles with mechanical A/C compressor
-- Make sure that the A/C compressor, with its refrigerant circuit filled with forming gas is not activated.
Insufficient lubrication for a refrigerant circuit filled with test gas.
There is a risk of damaging the A/C compressor.
- Do not start vehicle.
- Mark vehicle.
Continuation for all vehicles
-- Fill the refrigerant circuit using the Pressure Regulator R134A & R1234yf:VAS 584 007 slowly and in stages with forming gas (maximum of 13.5 bar). Refer to Owner's Manual.
-- Search the refrigerant circuit using the Gas Leak Detector:VAS 523 003 .
- Search all connection locations and coupling points from all sides.
- To search, slowly move the Gas Leak Detector:VAS 523 003 along the refrigerant lines (1 cm/ sec.).
- Searching the evaporator can be done via the vents, for example via the defroster vent. The opening diameter of the vent can be reduced with adhesive tape, for better detection.
-- Drain the forming gas via the Pressure Regulator R134A & R1234yf:VAS 584 007 . Refer to Owner's Manual.
-- Correct leaks.
-- Evacuate the refrigerant circuit after using forming gas for at least 30min.