Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSAUDI199590 QUATTRO SPORT V6-2.8L (AAH)REPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGREFRIGERANT PRESSURE SENSOR / SWITCHSPECIFICATIONS
1995 Audi 90 Quattro Sport V6-2.8L (AAH)
Refrigerant Pressure Sensor / Switch: Specifications
1995 Audi 90 Quattro Sport V6-2.8L (AAH)SECTION Specifications
A/C Refrigerant Switches
High Pressure F118:
Function: Switches A/C clutch off if system pressure is too high.
- Switch opens (compressor off): 28.2 - 31.0 bar (409 - 450 psi)
- Switch closes (compressor on): 10.3 - 17.2 bar (149 - 250 psi)
Tightening torque: 5 Nm (44 in. lb)
High Pressure F23:
Function: Switches coolant fan -V7- to 2nd speed.
- Switch closes (2nd speed on): 1.42 - 17.4 bar (206 - 252 psi)
- Switch opens (2nd speed off): 11.7 - 15.0 bar (170 - 218 psi)
- Difference between opening and closing switching points must be at least 2 bar (29 psi)
Tightening torque: 5 Nm (44 in. lb)
Low Pressure F73:
Function: Switches A/C clutch -N25- off if system suction pressure is too low (low refrigerant charge). This switch protects the compressor if the refrigerant system is empty.
- Switch opens (compressor off): 1.45 - 1.6 bar (21 - 23 psi)
- Switch closes (compressor on): 2.9 - 3.4 bar (42 - 49 psi)
Tightening torque: 5 Nm (44 in. lb)
High Pressure F118:
Function: Switches A/C clutch off if system pressure is too high.
- Switch opens (compressor off): 28.2 - 31.0 bar (409 - 450 psi)
- Switch closes (compressor on): 10.3 - 17.2 bar (149 - 250 psi)
Tightening torque: 5 Nm (44 in. lb)
High Pressure F23:
Function: Switches coolant fan -V7- to 2nd speed.
- Switch closes (2nd speed on): 1.42 - 17.4 bar (206 - 252 psi)
- Switch opens (2nd speed off): 11.7 - 15.0 bar (170 - 218 psi)
- Difference between opening and closing switching points must be at least 2 bar (29 psi)
Tightening torque: 5 Nm (44 in. lb)
Low Pressure F73:
Function: Switches A/C clutch -N25- off if system suction pressure is too low (low refrigerant charge). This switch protects the compressor if the refrigerant system is empty.
- Switch opens (compressor off): 1.45 - 1.6 bar (21 - 23 psi)
- Switch closes (compressor on): 2.9 - 3.4 bar (42 - 49 psi)
Tightening torque: 5 Nm (44 in. lb)
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.