Filling the air conditioning
Prerequisite
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 and NOTES ON AIR CONDITIONING REPAIR WORK .
- Determine the quantities of new
refrigerant oil to be refilled:
In addition to the drawn off and recorded coolant oil level, add the following quantities (if applicable):
- Top up the refrigerant oil losses over time as per the table:
Table 1 indicates the permitted loss of refrigerant after a specific period of time. There is no leak. Refrigerant oil must not be topped up.
Table 2 indicates the coolant oil level which must be topped up after a specific period of time with an impermissible loss of refrigerant due to a leak.
Case 1: Refrigerant loss is not exceeded as per Table 1:
- Top up missing refrigerant
- It is not permitted to top up the refrigerant oil
Case 2: Refrigerant loss is exceeded as per Table 1:
- Top up missing refrigerant
- Refrigerant oil must be topped up additionally as per Table 2
| Table 1/case 1 | |||||
|---|---|---|---|---|---|
| Number of years since last filling | 0-1 | 1-2 | 2-3 | 3-4 | 4-5 |
| Permissible loss [g] --> Do not top up refrigerant oil | ≤ 30 | ≤ 60 | ≤ 90 | ≤ 120 | ≤ 150 |
| Table 2/case 2 | ||
|---|---|---|
| Number of years since 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 |
- Add refrigerant oil as per the table if parts of the refrigerant circuit have been replaced:
Case 1: Part exchange as preliminary work for additional work and part exchange due to slow leakage (minor leak, e.g. hairline crack)
Case 2: Part exchange due to sudden leakage (major leak, e.g. line disconnection caused by accident)
| Case 1 | Case 2 | |||
|---|---|---|---|---|
| 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 | ||
| Per replaced refrigerant line | 10 ml | 35 ml | ||
| Safety pressure switch, gaskets | 0 ml | 0 ml | ||
|
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- Top up determined coolant oil level into the refrigerant circuit.
- Fill the amount of refrigerant as per the nameplate into the refrigerant circuit.
- Disconnect the high pressure line and low pressure line on the vehicle.
- Drain the high pressure line and low pressure line.
- Once again close the refrigerant filler neck on the vehicle with the sealing caps.