64 50 010 Drawing Off, Evacuating and Filling A/C System (R 134a)

64 50 010 - Drawing off, evacuating and filling A/C system (R 134a)





Warning!
Work on the refrigerant circuit may only be carried out by experts.
Refrigerant circuit is under high pressure!
- If the protective caps on the filler valves are difficult to open, there is a risk of injury from leaking valve inserts.
Repair work may only be carried out on a depressurized refrigerant circuit!
- Before conducting repairs, check the actual pressure drop on the pressure gauge of the A/C service station.
Avoid contact with refrigerant and refrigerant oil.
- Follow safety instructions for handling refrigerant R 134a.
- Follow safety instructions for handling refrigerant oil [1][2]64 50 ... Safety Instructions for Handling Refrigerant Oil.





Important!
Risk of damage!
Only BMW-approved R134a refrigerant may be used (refer to sourcing reference: Operating Fluids).
Use only BMW-recommended A/C service stations.
- Draw off, evacuate and fill the A/C system in accordance with the operating instructions of the relevant A/C service station.
Restart engine only when A/C system has been correctly filled.





Instructions for drawing off A/C system:
To help separation of refrigerant and refrigerant oil, run engine at low speed (800-1200 rpm) and with A/C system turned on for a few minutes.
The limits the entrainment of refrigerant oil while it is drawn off.
Drawn-off refrigerant oil must be changed and reintroduced via the A/C service station.
Refrigerant can re-evaporate. Before conducting repairs, observe the actual pressure drop on the pressure gauge of the A/C service station.





Recycling:
Dispose of drawn-off refrigerant oil as hazardous waste.
Observe country-specific waste-disposal regulations.





Instructions for evacuating off A/C system:
Before each filling, evacuate the refrigerant system.
Observe an evacuation time of at least 30 minutes.
The evacuation procedure removes all traces of ambient air, water vapor and any other gases present from the A/C system. This enables subsequent system filling with refrigerant.
A decrease in the vacuum level indicates a leak in the refrigerant circuit 64 50 ... Leak Testing With Ultraviolet Additives (UV Additives) (BMW Leak-Testing Case).





Instructions for filling A/C system:
To maintain filling accuracy, the vehicle must be standing on the workshop floor during filling.
Before filling with refrigerant, top up the refrigerant oil entrained during drawing off.
Follow instructions for opening and replacing parts Removal and Replacement in refrigerant circuit.
Depending on the type of component replaced on the A/C system, it may be necessary to top up the refrigerant oil, even if no measurable losses have occurred during drawing off.
Information on the required refrigerant fill quantity for the entire A/C system is contained on the rating plate (1) in the engine compartment.
If necessary, refer to the Technical Data for filling quantities [1][2]Capacity Specifications.

Installation:
Reseal refrigerant filler necks on vehicle with sealing caps.