Filling The Air Conditioning
Prerequisite
Service function must be active.
The engine is switched off.
Heating and air conditioning system is switched off.
The refrigerant circuit is evacuated and tight.
Vehicle must be positioned on the ground.
Injury hazard!
- Note and follow safety instructions on containers.
- Avoid contact with refrigerant; wear safety goggles and hand protection.
- For additional information see: NOTE FOR HANDLING R134A REFRIGERANT , NOTES REGARDING REFRIGERANT (R134A, R1234YF) AND REFRIGERANT OIL and NOTES ON AIR CONDITIONING REPAIR WORK .
Filling a raised vehicle will result in insufficient filling levels.
- For the amount of refrigerant oil drawn off and noted, determine the new amount of refrigerant oil that has to be filled additionally, if required.
- Check if the loss of refrigerant is below the approved loss.
| Approved loss of refrigerant | |||||
|---|---|---|---|---|---|
| No. of years since the last filling | 0-1 | 1-2 | 2-3 | 3-4 | 4-5 |
| Approved loss [g] | ≤ 30 | ≤ 60 | ≤ 90 | ≤ 120 | ≤ 150 |
If the loss is less than the approved loss, there is no leak. The refrigerant oil will not be topped up. Only refrigerant will be topped up.
The approved loss of refrigerant has been exceeded
- Determine the amount of refrigerant oil to be topped up.
When the actual loss of refrigerant oil exceeds the approved loss (e.g. due to leaks), refrigerant oil may have to be topped up in addition to the refrigerant.
| Top up quantity refrigerant oil | ||
|---|---|---|
| No. of years since the last filling | Loss of refrigerant [g] | Top up quantity refrigerant oil |
| 0-1 | < 120 | 0 |
| 0-1 | 120-150 | 10 |
| 0-1 | > 150 | 20 |
| 1-2 | < 180 | 0 |
| 1-2 | 180-210 | 10 |
| 1-2 | > 210 | 20 |
| 2-3 | < 240 | 0 |
| 2-3 | 240-270 | 10 |
| 2-3 | > 270 | 20 |
| 3-4 | < 300 | 0 |
| 3-4 | 300-330 | 10 |
| 3-4 | > 330 | 20 |
| 4-5 | < 360 | 10 |
| 4-5 | > 360 | 20 |
When replacing components in the refrigerant circuit: Determine the amount of refrigerant oil
- If components in the refrigerant circuit have been replaced: Increase the amount of refrigerant oil additionally with the following amounts.
| Part exchange of | with slow leak | with sudden leak | ||
|---|---|---|---|---|
| Air conditioning compressor(1). | (1). | (1). | ||
| Evaporator | 10 ml | 35 ml | ||
| Air conditioning condenser without integrated desiccant insert | 20 ml | 35 ml | ||
| Air conditioning condenser with integrated desiccant insert | 40 ml | 55 ml | ||
| Desiccant insert/dryer flask | 20 ml | 55 ml | ||
| for each replaced refrigerant line | 10 ml | 35 ml | ||
| per replaced safety pressure switch | 0 ml | 0 ml | ||
| per replaced seal | 0 ml | 0 ml | ||
|
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In the event of a slow leak components were replaced due to a minor leak (e.g. a hairline crack).
In the event of a sudden leak, components were replaced due to a major leak (e.g. a line break caused by an accident).
- Top up determined amount of refrigerant oil into the refrigerant circuit.
- Fill the amount of refrigerant according to the type plate on the refrigerant circuit.
- Disconnect the high pressure line and low pressure line on the vehicle.
- Drain the high pressure line and low pressure line.
- Close the sealing cap of the coolant filler neck.
| Capacity, refrigerant R134a | ||
| B48PHEV | 740 g | |