64 50 009 Drawing off, evacuating and filling A/C system (R 134a)
- If the protective caps on the filling valves are difficult to open, there is a danger 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 information for HANDLING R 134A REFRIGERANT .
- Follow safety information for HANDLING REFRIGERANT OIL .
Only BMW-approved R134a refrigerant may be used (refer to sourcing reference: HEATING AND AIR CONDITIONING -- OPERATING FLUIDS ).
Restart engine only when A/C system has been correctly filled.
If necessary, to connect service station, use manufacturer's adapter for high-pressure connection (red).
Instructions for drawing off heating and air conditioning 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 service station.
If at the end of the drawing-off procedure the service station moisture indicator shows that the drawn-off refrigerant is excessively moist, clean the refrigerant in accordance with the service station operating instructions.
Recycling:
Dispose of drawn-off refrigerant oil as hazardous waste.
Observe country-specific waste-disposal regulations.
Instructions for filling heating and air conditioning system:
Before filling with refrigerant, top up the refrigerant oil entrained during drawing off.
Also top up any lost fluid as indicated in the table:
Loss of R134a refrigerant
REFRIGERANT OIL PERMITTED LOSS REFERENCE CHART indicates the permitted loss of refrigerant after a specific period of time. There is no leak: refrigerant oil may not be topped up.
REFRIGERANT OIL TOP-UP QUANTITY REFERENCE CHART indicates the amount of refrigerant oil must be topped up with an unapproved loss of refrigerant due to a leak after a specific period of time.
Different cases:
- Loss of refrigerant per REFRIGERANT OIL PERMITTED LOSS REFERENCE CHART is not
exceeded.
- Top up lost R134a refrigerant
- It is not permitted to top up the refrigerant fluid
- Loss of refrigerant per REFRIGERANT OIL PERMITTED LOSS REFERENCE CHART is exceeded
- Top up lost R134a refrigerant
- Refrigerant fluid must be topped up additionally per REFRIGERANT OIL TOP-UP QUANTITY REFERENCE CHART
| Table 1: Number of years since last filling | 0 - 1 | 1 - 2 | 2 - 3 | 3 - 4 | 4 - 5 |
|---|---|---|---|---|---|
| Permissible loss [g] --> no need to top up refrigerant oil | ≤ 30 | ≤ 60 | ≤ 90 | ≤ 120 | ≤ 150 |
| Table 2: Number of years since last filling | R134a coolant loss [g] | Top up quantity refrigerant oil |
|---|---|---|
| 0 -1 | - <120 | 0 |
| 120 - 150 | 10 | |
| >150 | 20 | |
| 1 - 2 | - <180 | 0 |
| 180 - 210 | 10 | |
| >210 | 20 | |
| 2 - 3 | - <240 | 0 |
| 240 - 270 | 10 | |
| >270 | 20 | |
| 3 - 4 | - <300 | 0 |
| 300 - 330 | 10 | |
| >330 | 20 | |
| 4 - 5 | - <360 | 10 |
| >360 | 20 |
Follow INSTRUCTIONS FOR OPENING AND REPLACING PARTS 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. Read and comply with the A/C system manufacturer's notes in this regard and the operating instructions of the relevant service station.
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 Technical Data for fill quantities.
Installation note:
Reseal refrigerant filler necks on vehicle with sealing caps.