S4 Sedan L5-2226cc 2.22L DOHC Turbo (AAN) (1992)
Low Pressure Sensor / Switch: Service and Repair
Function
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Switches A/C compressor clutch OFF when A/C system suction pressure is too low (protects compressor when refrigerant system is discharged).
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Switch opens (compressor OFF): 1.6-1.7 bar (23-25 psi).
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Switch closes (compressor ON): 3.1-3.6 bar (45-52 psi).
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Located in plenum chamber, right.
Removing And Installing
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Remove plenum tray.
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Remove A/C refrigerant low pressure switch. Refrigerant system remains closed (valve under switch).
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Install new O-ring -A- (9.3 mm x 1.8 mm). Tightening torque: 5 Nm (44 in lb).
NOTE: Only use O-rings specified for use with R-12 refrigerant and refrigerant oil.
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DO NOT reuse O-rings, always replace.
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Lubricate O-rings with A/C refrigerant oil before installing.
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Always use correct size O-ring.
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During installation, ensure proper seat in groove.
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Keep work area, components and O-rings clean.