Oil, Air Conditioning (A/C) System, Filling

Oil, Air Conditioning (A/C) System, Filling

Special tools: 981 1994-4

Topping up the lubricating oil

WARNING: Do not mix oil types. Always use the correct type of compressor oil.

NOTE: Too much lubricating oil will impair cooling. Too little lubricating oil will damage the compressor.

The oil must be topped up when repairing a leak or when replacing a component. The quantity required for the component in question will depend on whether leakage has taken place slowly or quickly.

Slow leakage (longer than 24 hours)

- With a slow leak, there is normally minimal risk of oil loss.
- When installing new components the following procedures apply:

Rapid leakage (e.g. hose rupture)

- Rapid leakage often means that lubricating oil escapes with the refrigerant.







- Compressor.

Preparatory operations for oil return

- Measure the volume of the oil drained from the compressor.
- Replace the volume of drained oil according to the table below:







CAUTION: When installing a completely new system: Check that there is oil in the compressor. The other components should contain no oil.

Replacing the receiver

Replace the receiver in the following instances:

- When replacing the compressor (compressor seizure for example).
- Refrigerant leakage, where nearly 100% has leaked out of the system. (The system has no pressure).
- When replacing any air conditioning (A/C) component outside the warranty period.

Filling the A/C system with oil

NOTE: Fill with oil before vacuum pumping.

Filling with PAG oil







- When replacing pipes or hoses the oil can be filled through the service valve.

The procedure for topping up PAG oil (P/N 8708581�7) in the car is as follows:
- Remove the needle valve in the service valve using valve tool 981 1994-4.

Use the filling syringe (without plastic hose) supplied with the unit to top up the oil. Clean the syringe to avoid the possibility of mixing different types of oil.

- Check according to the table above. Measure how much oil is to be added. After topping up the oil, reinstall the needle valve.

NOTE: Use only your thumb and index finger when tightening the service valve using the valve needle tool 981 1994-4 . This is to prevent damage to the seal for the valve.