Refrigerant Circuit, Flushing

NOTE:

In the case of vehicles on which the refrigerant lines have no threads for connection of Adapter Set -1785-. Use for example a flushing gun with rubber end piece or an adapter from the Refrigerant Circuits Adapter Set 1 :VAS6338/1 for blowing through the individual components. When using a flushing gun with rubber end piece, take special care not to damage the connections (crushing or scratching).

Evaporator is to be flushed via the connection for low-pressure line (large diameter) after removing expansion valve or removing restrictor.

Always clean (flush or blow) components in direction opposite to refrigerant flow.

Check expansion valve and replace if dirty or corroded.

Locate any components on which dark, sticky deposits cannot be removed with compressed air and either clean (flush) them using refrigerant R134a or replace them.

Thin, light grey deposits on the inside of lines do not impair the function of the components.

After flushing, always replace receiver/dryer or reservoir and restrictor. Replace the dryer cartridge on condensers that have one installed in the integrated receiver/dryer.

If the receiver/dryer or dryer cartridge is integrated in the condenser, then they cannot be replaced separately and the condenser must be replaced. Refer to the Parts Information and Refrigerant Circuit .

Receivers/dryers where it is possible to replace the dryer cartridge have an additional filter, which must also be replaced with the dryer cartridge.

After Blowing through the Refrigerant Circuit:

-- Replace these components depending on equipment (restrictor and reservoir, expansion valve and receiver/dryer or dryer cartridge). Refer to Refrigerant Circuit and the Parts Information.

-- Replace the A/C compressor, depending on its condition. Refer to A/C Compressor and Parts Information or drain the rest of the refrigerant oil still inside the removed A/C compressor (replace the refrigerant circuit components) and will new refrigerant. Refer to REFRIGERANT CIRCUIT COMPONENTS, REPLACING and REFRIGERANT R134A CAPACITIES, REFRIGERANT OIL AND APPROVED REFRIGERANT OILS .

NOTE:

There is a defined and prescribed amount of refrigerant oil in the replacement compressor. If the vehicle has two evaporators, then there refrigerant circuit requires a specific quantity of refrigerant oil. Refer to Refrigerant Circuit and REFRIGERANT R134A CAPACITIES, REFRIGERANT OIL AND APPROVED REFRIGERANT OILS . (Approved Refrigerant Oils and Capacities).

If the A/C compressor is not be replaced, the quantity of refrigerant oil in the A/C compressor must be topped off to the prescribed capacity (tilt the refrigerant oil out and refill the prescribed quantity into the A/C compressor or refrigerant circuit). Refer to REFRIGERANT CIRCUIT COMPONENTS, REPLACING (replacing refrigerant circuit components) and REFRIGERANT R134A CAPACITIES, REFRIGERANT OIL AND APPROVED REFRIGERANT OILS . Approved Refrigerant Oils and Capacities).

-- Reassemble the refrigerant circuit completely. Refer to Refrigerant Circuit .

-- Evacuate and recharge the refrigerant circuit according to specification. Refer to REFRIGERANT CIRCUIT, EVACUATING WITH A/C SERVICE STATION and REFRIGERANT CIRCUIT, CHARGING WITH A/C SERVICE STATION .

-- Start up A/C system according to specification. Refer to A/C SYSTEM, STARTING AFTER CHARGING REFRIGERANT CIRCUIT and A/C SYSTEM, OPERATING AFTER CHARGING .