Specialized Refrigerant Circuit Repairs
There is a danger of ice-up.
Refrigerant leaks out if refrigerant circuit is not discharged.
Refrigerant must be extracted before opening the refrigerant circuit. If refrigerant circuit is not opened within 10 minutes after extracting, pressure may build up in refrigerant circuit by renewed evaporation. Extract refrigerant once more.
Information on repair work in vehicles with climate control system and on handling refrigerant can be found in General Information .
Information on tools for repairs in vehicles with climate control system can be found in SPECIAL TOOLS .
Refrigerant must be extracted before hand using, for example A/C service station ROB 134APF.
The previously used A/C Service Station can still be used.
To prevent the entry of dampness all components of the refrigerant circuit which have been opened must be sealed with suitable plugs.
The color coding of refrigerant circuit O-rings with R134a has been discontinued. Colored and black O-rings are used.
Under certain conditions, fluid reservoir with dryer cartridge is no longer to be replaced after each time the refrigerant circuit is opened. For further information, refer to Removal and Installation .
The refrigerant circuit is to be flushed under the following conditions:
- In the event of dirt or other contamination in the refrigerant circuit.
- If vacuum reading is not maintained on evacuating a leak-free refrigerant circuit (pressure build-up due to moisture in refrigerant circuit).
- If refrigerant circuit has been left open for longer than normal (for example, following an accident).
- If pressure and temperature measurements in the refrigerant circuit indicate the likelihood of moisture in the circuit.
- In the event of doubt about the amount of refrigerant oil in the circuit.
- The A/C compressor had to be replaced on account of internal damage (for example, noise or no output).
The procedure for flushing with R134a refrigerant is described in REFRIGERANT CIRCUIT, FLUSHING WITH REFRIGERANT R134A .
Information for repairing vehicles with air conditioning and working with refrigerant can be found in General Information .
Information for special tools and equipment when repairing vehicles with air conditioning can be found in SPECIAL TOOLS .