All A/C compressors
The A/C compressor extracts the refrigerant gas from the evap‐
orator, compresses it and relays it to the condenser.
Note
♦
The A/C compressor contains refrigerant oil, which can be
mixed with refrigerant R134a under any temperature.
♦
The type plate lists the type of refrigerant required for the A/C
compressor. A regulator valve regulates pressure within the
specified range (control characteristics) on the low pressure
side.
♦
A/C compressors with or without a magnetic clutch are cur‐
rently controlled externally by a regulator valve -C-.
♦
On A/C compressors without an A/C clutch, the engine is only
to be started following complete assembly of the refrigerant
circuit.
♦
So that the A/C compressor does not get damaged when the
refrigerant circuit is empty, the A/C clutch is turned off and the
A/C compressor regulator valve -N280- is no longer activated
(A/C compressor runs at idle with engine).
♦
If the refrigerant circuit is empty, a A/C compressor without A/
C clutch -N25- with ( A/C compressor regulator valve -N280- )
is switched to internal lubrication by way of a valve.
♦
Depending on the A/C compressor version, there may be a
valve installed on the high pressure side of the A/C compres‐
sor, which prevents the liquid refrigerant from flowing back into
the compressor once the A/C is turned off. If an A/C compres‐
sor with this valve is installed in a vehicle with a refrigerant
circuit having an expansion valve, then it may take some time
until the pressure in the high pressure side decreases (the ex‐
pansion is cold and the pressure in the low pressure side
quickly increases after it is turned off, the expansion valve
closes and the refrigerant flows slowly into the low pressure
side). If the A/C compressor is switched on, the pressure on
the low pressure side goes down, the expansion valve open
and the refrigerant can flow of the low pressure side.
♦
The electro-magnetic clutch -A- is activated only when the
regulator valve -C- is activated on an A/C compressor with an
electro-magnetic clutch -A- and with a regulator valve -C-,.
Refer to ⇒ Heating, Ventilation and Air Conditioning; Rep. Gr.
87 ; General Information .
2.1.2 Adapter for Assembling Flushing Circuit
♦ Various adapters which are required to connect the A/C serv‐
ice station to the refrigerant circuit for flushing and to bridge
the removed fluid reservoir or reservoir and expansion valve
(specific to vehicle) are in the following table.
♦ Using a charge hose with 5/8 -18 UNF connections (short ver‐
sion, for example, Charge hose -VAS 6338/31- ), connect the
two adapters (contained in VW/Audi passenger vehicle set
adapter chest -VAS 6338/1- ) which have been installed for
the removed reservoir or fluid reservoir.
♦ If a flushed refrigerant circuit is not reassembled immediately
after flushing, adapters remain at connections and seal the
connections at the adapters using Shipping caps -VAS
6338/30- (from Adapter case for VW/Audi passenger cars -
VAS 6338/1- ).
Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ...
Refrigerant R134a Servicing - Edition 01.2011
42 Rep. Gr.00 - General, Technical Data
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