Refrigerant Circuit, Evacuating With A/C Service Station

WARNING: This page is about a different car, the 2014 Volkswagen Touareg, 2013 Volkswagen Touareg, 2012 Volkswagen Touareg, and 2011 Volkswagen Touareg. However, it is still accessible from the selected car via links, so may be relevant.

The work procedure is always to be performed as described in the operating instructions for the A/C Service Station.
The procedure described here is for the A/C Service Station.

Before filling the refrigerant circuit with refrigerant, it should be evacuated (vacuum) for 45 minutes on systems with one evaporator and 60 minutes on systems with two evaporators. Moisture is also extracted from the circuit.

Leaks may be found when evacuating the refrigerant circuit.

Evacuating

CAUTION:

- Never start the engine with the refrigerant circuit empty.

-- Switch off the ignition.

-- Check Refrigerant Oil Quantity In Refrigerant Circuit If Necessary, See Vehicle-Specific Service Information. Refer to MAINTENANCE (FLUID CAPACITY TABLES), DIAGNOSIS (2011) / MAINTENANCE (FLUID CAPACITY TABLES), DIAGNOSIS (2012) / MAINTENANCE (FLUID CAPACITY TABLES), DIAGNOSIS (2013) / MAINTENANCE (FLUID CAPACITY TABLES), DIAGNOSIS (2014) .

-- Connect the A/C Service Station to the power supply.

-- Check the amount of refrigerant in the A/C Service Station.

-- Connect the charging hose of the A/C Service Station to the vehicle refrigerant circuit with the quick-release coupling adapter (refer to vehicle-specific refrigerant circuit).

Refer to the appropriate service information .

-- Install the hand wheel on the quick-release coupling adapter far enough so that the valves in the service connections are securely open. Do not put too much pressure on the valve.

NOTE:

If pressure is to be measured after charging system on vehicles with a service connection on one side of the refrigerant circuit only, use valve adapter and charging hose with valve opener.

-- Initiate the vacuum phase on the A/C Service Station. The refrigerant circuit is automatically evacuated. Check the preset evacuating time if necessary.

When the vacuum phase ends, the refrigerant circuit leak test begins. Pressure in bar and seconds are displayed.

Proceed as follows if the vacuum is not maintained:

-- Initiate the vacuum phase on the A/C Service Station once more. The refrigerant circuit is automatically evacuated. Check the preset evacuating time if necessary. Watch the vacuum indicator for an extended period of time. Only when the vacuum is maintained can the refrigerant circuit be charged.

If there is a leak that allowed enough air to enter during evacuation that the A/C Service Station cannot generate a sufficient vacuum or that the vacuum is lost immediately after switching the A/C Service Station off:

-- Determine the location of the leak in the refrigerant circuit as follows. Refer to REFRIGERANT CIRCUIT, DETECTING LEAKS .