A8 Sedan V8-3.7L (AEW) (1997)
Low Pressure Sensor / Switch: Service and Repair
A/C Refrigerant Low Pressure Switch -F73-
Function
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Switches A/C compressor off in the event of pressure drop in refrigerant system (protects compressor when circuit empty).
Switching pressures:
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Compressor off (switch opens) 1.45 up 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 connector -A-.
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Replace O-ring -B- (8.9 x 1.8 mm).
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Tightening torque: 5 Nm (44 in.lb)
NOTE:
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To test the A/C system cooling performance, with the switch removed, bridge the two terminals in connector -A-.
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The refrigerant system remains closed due to the Schrader valve.