S4 Quattro Cabriolet V8-42L HVAC High Pressure Sensor Testing | Page 8751
High Pressure Sensor / Switch: Service and Repair
High Pressure Sensor
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Remove front bumper.
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Disconnect connector - B -.
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Remove the high pressure sensor - C -, tightening torque: 5 Nm.
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Replace the O-ring seal - A - (10.8 mm; 1.8 mm) => [ Refrigerant Circuit O-Ring Seals ] See: Refrigerant/Description and Operation/Refrigerant
Circuit.
‹› Cooling performance cannot be checked with high pressure sensor removed, A/C control head Climatronic control module does not switch on the
compressor.
‹› The refrigerant circuit remains closed, "connection with valve ".
‹› Check the function of the high pressure sensor and the transmitted signal => [ Test Step 5 ] See: Testing and Inspection/Component Tests and
General Diagnostics/Climatronic Control Module A/C Control Head Electrical Test and => [ High Pressure Sensor Pressure Signal ] See: Testing
and Inspection/Component Tests and General Diagnostics/Climatronic Control Module A/C Control Head Electrical Test.