General Information For Replacing Components

WARNING: This page is about a different car, the 2018 Volkswagen Jetta, 2017 Volkswagen Jetta, 2016 Volkswagen Jetta, and 2015 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.

The Receiver/Dryer Or Desiccant Bag Cartridge Should Not Be Replaced Under The Following Conditions

The opened refrigerant circuit was closed immediately with clean plugs for example plugs from the Engine Bung Set :VAS6122 .
After an accident when there is no damage on the receiver/dryer.
The repair was done quickly (not beyond the normal repair time).
The vehicle is not older than five years.

The Receiver/Dryer Or Dryer Cartridge Should Be Replaced Under The Following Conditions

The refrigerant circuit has been opened for an indefinite period of time (slow leak).
The receiver/dryer is damaged (accident).
The repair exceeded the normal repair time.
The refrigerant circuit was opened and the vehicle is older than five years.
The refrigerant circuit is blown though with nitrogen.
The refrigerant circuit was flushed with R1234yf.
The A/C compressor has locked up.

Any refrigerant circuit components submitted for quality observation must be sealed (use the original caps from the replacement part).
Replace damaged or leaking refrigerant circuit components. Refer to COMPONENTS, REPLACING .
Any refrigerant circuit components submitted for quality observation must be sealed (use the original caps from the replacement part).
To date, the replacement parts A/C compressor, receiver/dryer, evaporator and condenser have been filled with nitrogen gas. This charging stops gradually or the charging pressure is so low that gas does not escape noticeably when opening.
On vehicles installed with a compressor with no A/C clutch, the engine is only to be started following complete assembly of the refrigerant circuit (A/C compressor always in operation as well).
When the refrigerant circuit is empty, the A/C compressor with A/C Compressor Regulator Valve -N280- (without A/C Clutch -N25-) is switched to internal lubrication with the result that only a minimal amount of oil is pumped from the compressor into the circuit.

NOTE:

The following replacement part (A/C compressor, reservoir, evaporator and condenser) can be filled with nitrogen gas, this filling is not always present. Therefore little or no pressure equalization is noticeable when unscrewing plugs from replacement parts.

Depending on the storage location and storage time components which were filled with nitrogen gas from the manufacturer little or no pressure equalization is noticeable when unscrewing plugs the first time, so it is not possible to make a prediction about the presents of leaks in the components. So for example can the nitrogen gas which was filled via the shaft seal from a replacement part A/C compressor flow out over time via the shaft seal although the A/C compressor does not have any leaks.

As parts are sometimes stored for lengthy periods and at different locations within the spare parts organization, it is entirely possible that gas will escape from some parts and not from others on initial opening (even in the case of identical spare part numbers). Sealing caps at replacement part connections are therefore to be removed carefully and the nitrogen gas allowed to escape slowly.

In the refrigerant circuit there are one or two expansion valve and a receiver/dryer or dryer vessel installed. Refer to REFRIGERANT CIRCUIT .

Replace the dryer cartridge or components with desiccant bag (receiver/dryer) after cleaning (flushing with refrigerant R1234yf. Refer to REFRIGERANT CIRCUIT, CLEANING ) the refrigerant circuit at the same time hold sealed as long as possible so that the absorption of moisture is as little as possible.

Seal open connections and pipes (to prevent absorption of moisture).

NOTE:

Dispose of dirty or used oils of unknown origin paying attention to local regulations.