Low Pressure Sensor / Switch: Testing and Inspection

Switch -F129-:

- Ensure 0-ring (color: black) 10.8 mm x 1.8 mm fits proper in groove.

Functions:
Pressure switch component between blue wires switches A clutch -N25- off when too little or excess refrigerant system pressure is present.
- Switch opens (compressor off) below 2 bar (29.4 psi) and closes (compressor on) above 3 bar (43.5 psi).
- Switch opens (compressor off) above 32 bar (464 psi) at closes (compressor on) below 24 bar (348 psi).

Switch, Checking:
- Briefly bridge connections from terminal 1 and 2 with engine running.
- If A/C clutch -N25- switches on, refrigerant circuit is s

Pressure switch component between red1black wiring switch coolant fan -V7- to 2nd speed when refrigerant pressure rise
- Switch closes (fan on) above 16 bar (232 psi) and opens again (fan off) below 12.5 bar (181.25 psi).