A4 Sedan V6-2.8L (AFC) (1996)
High Pressure Sensor / Switch: Service and Repair
A/C Refrigerant System (R-134a) Switches & Sensors, Servicing (1996)
A/C Refrigerant High Pressure Switch -F23-/-F118-
Function:
High pressure switch -F23- (contacts -1- and -2- in switch -A-) switches coolant fan V7 into stage 2 (contacts -1- and -2- in connector -B-) when A/C
system pressure increases.
Switching pressures:
-
Fan stage 2 on (switch closes): 14.3 to 17.3 bar pressure
-
Fan stage 2 off (switch opens): 10.9 to 15.3 bar pressure
-
Pressure difference between switching points: 2.0 to 3.4 bar
High-pressure switch F118 (contacts -3- and - 4- in switch -A-) switches the compressor off via A/C control head E87 (contacts -3- and -4- in connector
-B-) if excess pressure exists in refrigerant system.
Switching pressures:
-
Compressor off (switch opens): 28.2 to 31.0 bar pressure
-
Compressor on (switch closes): 11.5 to 15.0 bar pressure
Removing and installing
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Remove front bumper.
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Disconnect electrical harness connector.
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Replace O-ring seal -A-, 7.6 mm; 1.8 mm.
Tightening torque: 5 Nm (44 in lb)