Refrigerant Pressure Sensor / Switch: Testing and Inspection

A/C Pressure Switch -F129-, Checking







- Ensure O-ring (10.8 mm x 1.8 mm) fits properly in groove (color: black)

Functions

- Switches A/C clutch -N25- OFF if system pressure is too low (low refrigerant charge) - switching occurs between blue wires
- Switch opens (compressor OFF): below 2.0 bar (29.0 psi)
- Switch closes (compressor ON): above 3.0 bar (43.5 psi)
- Switches A/C clutch -N25- OFF if system pressure is too high - switching occurs between blue wires
- Switch opens (compressor OFF): above 32.0 bar (464.1 psi)
- Switch closes (compressor ON): below 24.0 bar (348.1 psi)
- Switches coolant fan -V7- to second speed when A/C system pressure increases (switching occurs between red and black wires)
- Switch closes (2nd speed ON): above 16.0 bar (232.0 psi)
- Switch opens (2nd speed OFF): below 12.5 bar (181.3 psi)
- To remove, remove switch from Schrader valve tightening torque: 8 Nm (71 in. In)