Heating and Air Conditioning: Service and Repair

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.

CAUTION:
- Risk of damage!
- Only restart engine when A/C system has been correctly filled.

Carry out A/C system drawing off, evacuation and filling in accordance with operating instructions of appropriate service station.

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.
This limits refrigerant oil entrainment during drawing off.
Drawn-off refrigerant oil must be replaced and readded via the service station.

If at the end of the drawing-off operation the moisture indicator on the relevant service station indicates an excessive moisture level in the drawn-off refrigerant, the refrigerant must be cleaned following the service station operating instructions.

Recycling:
Dispose of refrigerant oil as hazardous waste.
Observe country-specific waste-disposal regulations.

Instructions for evacuating 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, replenish the refrigerant oil entrained during the drawing-off procedure.

Depending on the type of component replaced on the A/C system, it may be necessary to replenish the refrigerant oil even if no measurable losses have occurred during drawing off. Follow the relevant instructions of the A/C system manufacturer and the operating instructions of the 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.

For further information on fill quantities and specifications, refer to Specifications.


Installation:
Close filler neck on vehicle with sealing caps.