A4 Sedan V6-2.8L (AFC) (1996)
Low Pressure Sensor / Switch: Service and Repair
A/C Refrigerant System (R-134a) Switches & Sensors, Servicing (1996)
A/C Refrigerant Low Pressure Switch -F73-
Function:
Switches off the compressor in the event of a pressure drop in the refrigerant system (protects the compressor when refrigerant system empty).
Switching pressures:
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Compressor off (switch opens): 1.45 to 1.6 bar pressure
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Compressor on (switch closes): 2.9 to 3.4 bar pressure
Removing and installing
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Unplug electrical connector -A-.
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Replace O-ring seal -B-, 8.9 mm; 1.8 mm.
Tightening torque: 5 Nm (44 in lb)
NOTE:
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To test refrigeration system pressures with switch -C- removed, bridge the two contacts in connector -A-.
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The refrigerant system remains closed due to the Schrader valve.