Empty the air conditioner (Solution)

Drain the air conditioner.

The refrigerant oil can be drained from the compressor. Always replace the drain plug.

Purge the refrigerant circuit with compressed air and nitrogen.

To effectively remove moisture, other contaminants, and aged refrigerant oil, while minimizing refrigerant consumption and avoiding complex installation procedures, compressed air and nitrogen should be used.

Caution!
Only use pressure regulators with nitrogen tanks.
The gas mixture escaping from the components should be extracted using appropriate exhaust systems.

Always blow air through the components in the opposite direction of the refrigerant flow.
Compressed air and nitrogen cannot be blown through the throttle, expansion valve, compressor, liquid reservoir, or collection tank.
For capacitors with a dryer, the dryer cartridge needs to be removed.
First, use compressed air to blow out old refrigerant oil and dirt, then use nitrogen to dry the components.
The compressed air must be passed through an air purification and drying system.


For refrigerant lines with threaded connections or flared fittings, use adapters from the V.A.G. 1785 adapter set (adapters 1785/1 to 1785/icon_cool.gif) to connect the filling hoses with a 5/8" -18 UNF thread.
For refrigerant lines without threads or a coupling nut at the connection (for attaching adapters), use a commercially available blow gun with a rubber nozzle.
The refrigerant circuit should be purged first with compressed air and then with nitrogen.
Air escaping from the components, or... Nitrogen should be extracted using a suitable system (e.g., a workshop extraction system).

The circuit breaker should be reset when:
- If dirt or other contaminants are present in the system.

- If the vacuum gauge fails to maintain the required vacuum level during the evacuation of a closed refrigerant circuit...
(Moisture is present in the refrigerant cycle and is building up pressure).

- The refrigerant circuit was opened during the normal assembly time (e.g., after an accident).

Based on pressure and temperature measurements within the circuit, it is assumed that moisture is present in the refrigerant circuit.

- There is uncertainty regarding the amount of refrigerant oil in the refrigerant circuit.

- The compressor had to be replaced due to internal damage (e.g.,). Sounds or no output.



For vehicles where the refrigerant lines do not have threads for connecting the V.A.G 1785 adapter, a blow-out gun with a rubber nozzle should be used to purge the individual components. It is particularly important to ensure that the connections are not damaged (bent or scratched).
The evaporator should be purged through the connection for the low-pressure line (larger diameter) when the expansion valve or throttling device is removed.
Always blow air through the components in the opposite direction of the refrigerant flow.
Check the expansion valve; if it is dirty or corroded, replace it.
If there are dark, sticky deposits on the components that cannot be removed with compressed air, replace those components.
Thin, light gray deposits on the inside (of the pipes) do not affect the function of the components.
After blowing, it is generally necessary to replace liquid containers or collection containers, as well as the throttle. For capacitors with a dryer, the dryer cartridge needs to be replaced.
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