Audi A4 2001 - Air Conditioner Component Identification

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2.1.17 Restrictor
The restrictor creates a constriction. This restriction reduces the
flow and creates high and low pressure sides in the refrigerant
circuit. Before the restrictor the refrigerant which is under a higher
pressure is warm. After the restrictor the refrigerant which is under
a low pressure is cold. Before the restriction there is a strainer for
contaminants and after the restriction there is a strainer, to atom‐
ize the refrigerant before it reaches the evaporator.
Note
♦ Arrow -A- on restrictor points to evaporator.
♦ Replace after each opening of the circuit.
♦ There are different versions, therefore pay attention to the dif‐
ferent customer service information sources. Refer to ⇒ Heat‐
ing, Ventilation and Air Conditioning; Rep. Gr. 87 ; Description
and Operation (vehicle-specific repair manual) and to the
Electronic Parts Catalog (ETKA).
2.2 Switches and Sensors on Refrigerant
Circuit and Connections
⇒ “2.2.1 A/C Compressor Regulator Valve N280 “, page 74
⇒ “2.2.2 A/C Compressor Speed Sensor G111 “, page 75
⇒ “2.2.3 A/C Pressure Switch F129 “, page 75
⇒ “2.2.4 A/C Pressure/Temperature Sensor G395 “, page 76
⇒ “2.2.5 A/C Refrigerant High Pressure Switch F23 “, page 76
⇒ “2.2.6 A/C Refrigerant High Pressure Switch F118 “,
page 76
⇒ “2.2.7 A/C Refrigerant Low Pressure Switch F73 “, page 77
⇒ “2.2.8 High Pressure Sensor G65 “, page 77
⇒ “2.2.9 Refrigerant Temperature Sensor G454 “, page 78
2.2.1 A/C Compressor Regulator Valve -
N280-
The regulator valve is implemented into the compressor. It is con‐
trolled by the Front A/C display control head -E87- or the Clima‐
tronic control module -J255- (depending on the vehicle, possibly
via the databus of the an additional control module). Refer to ⇒
Heating and Air Conditioning; Rep. Gr. 87 ; Description and Op‐
eration (vehicle-specific repair manual). Pressure on the low pres‐
sure side is influenced via the regulator valve and thus regulates
the temperature in the evaporator.
Note
The A/C compressor regulator valve is a component of the A/C
compressor and cannot be replaced separately.
Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ...
Refrigerant R134a Servicing - Edition 01.2011
74 Rep. Gr.00 - General, Technical Data