Audi A4 2001 - Page 160

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• Recirculated/fresh-air door set to “Recirculated air
mode“ (within 1 minute, after starting vehicle, air-flow door is
closed and recirculated-air door opened)*
• The coolant shut-off valve closed.*
• Valves of pump valve unit closed and no coolant circulation
pump delivery*
• Compressor is actually driven ( A/C clutch -N25- operated,
overload safeguard (if installed) not tripped)*
Note
The A/C compressor is driven by different components depending
on the engine (belt or input shaft). The belt pulley or the drive unit
has an overload protection to protect these components and the
engine, if the A/C compressor is runs with resistance. Refer to ⇒
Heating, Ventilation and Air Conditioning; Rep. Gr. 87 ; Descrip‐
tion and Operation (vehicle-specific repair manual).
4.4.3 Pressures, Checking
♦ Observe test requirements, refer to
⇒ “4.4.2 Test Prerequisites“, page 154 .
– Switch off the ignition.
– Connecting service station. Refer to
⇒ “2.4 A/C Service Station“, page 79 .
– Take pressure gauge readings (two possible results).
♦ Pressure in refrigerant circuit lower than indicated in table
♦ Pressure in refrigerant circuit in line with table or higher
Ambient temperature (in de‐
grees Celsius)
Pressure in refrigerant circuit in
bar positive pressure
+15 °C 3.9
+20 °C 4.7
+25 °C 5.6
+30 °C 6.7
+35 °C 7.8
+40 °C 9.1
+45 °C 10.5
Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ...
Refrigerant R134a Servicing - Edition 01.2011
156 Rep. Gr.00 - General, Technical Data