Blowing through Refrigerant Circuit
WARNING: This page does not describe the selected car, but rather 17 other vehicles, including the 2009 Audi S4, 2009 Audi A4, 2008 Audi S4, 2008 Audi RS 4, and 2008 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
- In the case of vehicles on which the refrigerant pipes have no threads for connection of Adapter set refrig cir R 134a V.A.G 1785 , use e.g. a flushing gun with rubber end piece or an adapter from the adapter case for VW/Audi passenger cars VAS 6338/1 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 by way of connection for low-pressure pipe (large diameter) after removing expansion valve or removing restrictor.
- Always flush or blow through components in direction opposite to refrigerant flow.
- Check expansion valve and replace if dirty or corroded.
- Replace any components on which dark, sticky deposits cannot be removed with compressed air. Flush these components using refrigerant R134a or replace.
- Thin, light grey deposits on the insides of pipes do not impair the function of the components.
- After flushing, always replace receiver or reservoir and restrictor. Replace dryer cartridge on condensers on which the dryer cartridge is installed in the integrated receiver.
After blowing through the refrigerant circuit:
- Replace these components depending on equipment (restrictor and reservoir, expansion valve and fluid reservoir or dryer cartridge) and → Electronic Parts Catalog ETKA
- Depending on the kind of complaint, replace compressor → 87 - Air conditioning and → Electronic Parts Catalog ETKA or drain the remaining refrigerant oil from the compressor removed → Refrigerant Circuit Components, Replacing (replace components of refrigerant circuit) and refill the prescribed amount of fresh refrigerant oil → Approved Refrigerant Oils (Approved refrigerant oils and capacities for refrigerant oil)
NOTE:
- There is a defined and prescribed amount of refrigerant oil in the replacement compressor. If necessary, a certain amount of refrigerant oil must be filled into the circuit in addition on vehicles with two evaporators → 87 - Air conditioning and → Approved Refrigerant Oils (Approved refrigerant oils and capacities for refrigerant oil).
- If the compressor will not be replaced, the refrigerant oil in the compressor must be topped up to the prescribed amount (pour out refrigerant oil and fill the prescribed amount into the compressor or the refrigerant circuit) → Refrigerant Circuit Components, Replacing (Replacing components of refrigerant circuit) and → Approved Refrigerant Oils (Approved refrigerant oils and capacities of refrigerant oil)
- Reassemble the refrigerant circuit completely → 87 - Air conditioning .
- Evacuate and recharge refrigerant circuit according to specification.
- Start up A/C system according to specification.