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

Drawing Off, Evacuating And Filling A/C System (R 134a)

WARNING:
Avoid contact with refrigerant and refrigerant oil.
Follow safety instructions for handling refrigerant R 134a.
Follow safety instructions for handling refrigerant oil.

IMPORTANT:
Risk of damage.
Restart engine only when A/C system has been correctly filled.

NOTE:
Draw off, evacuate and fill the A/C system in accordance with the operating instructions of the relevant service station.
E60 only:
If necessary, to connect service station, use manufacturer's adapter for high-pressure connection (red).

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 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 evacuating off A/C system:
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.

Instructions for filling A/C system:







Before filling with refrigerant, top up the refrigerant oil entrained during drawing off.
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:
Reseal refrigerant filler necks on vehicle with sealing caps.