Refrigerant Circuit, Specialized Repairs
- Information regarding performing repairs on vehicles with air conditioning and working with refrigerant. Refer to A/C SYSTEM, REPAIR INFORMATION .
- Information on tools for repairs in vehicles with climate control system. Refer to SPECIAL TOOLS .
- Under certain conditions, the dryer cartridge should no longer be replaced each time the refrigerant circuit is opened.
- The procedure for flushing with refrigerant R134a is described in REFRIGERANT CIRCUIT, FLUSHING WITH REFRIGERANT R134A
Danger due to refrigerant coming out under pressure.
Danger of frost bite to skin and other parts of the body.
- Extract the refrigerant and immediately open the refrigerant circuit after that.
- If the refrigerant was extracted more than 10 minutes in the past and the refrigerant circuit was not opened, extract the refrigerant again. Pressure in the refrigerant circuit is caused by evaporation.
- Flush the refrigerant circuit with R134a refrigerant 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 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).
Information for repairing vehicles with air conditioning and working with refrigerant, refer to A/C SYSTEM, REPAIR INFORMATION .
Information for special tools and equipment when repairing vehicles with air conditioning, refer to SPECIAL TOOLS .
Note the following on a vehicle with a Start/Stop System. Refer to START/STOP SYSTEM .
There is a danger of ice-up.
Refrigerant leaks out if refrigerant circuit is not discharged.
Refrigerant must be extracted before opening refrigerant circuit. If refrigerant circuit is not opened within 10 minutes of extraction, pressure may form in refrigerant circuit due to evaporation. Extract refrigerant once more.
Flush the refrigerant circuit with R134a refrigerant 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 buildup due to moisture in refrigerant circuit).
If refrigerant circuit has been left open for longer than normal (e.g. following an accident).
If pressure and temperature measurements in the refrigerant circuit indicate the likelihood of moisture
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 (e.g. noise or no output).
The procedure for flushing with R134a refrigerant is described in REFRIGERANT CIRCUIT, FLUSHING WITH REFRIGERANT R134A .
Tools and Equipment
Information for special tools and equipment when repairing vehicles with air conditioning, refer to SPECIAL TOOLS .
Special tools and workshop equipment required
- Torque Wrench V.A.G 1783
- A/C service station VAS 6007A or succeeding model.
- "Ratchet Insert 1/4" VAS 6234
- Socket insert T10364