Valves and Switches

NOTE: The following A/C system switches are available in different versions. Always consult the proper parts information to ensure correct switch application.





A/C refrigerant high pressure switch -F23-
Function
- Switches coolant fan -V7- to second speed when A/C system pressure increases.
- For switching pressures and removing and installing switch.





A/C refrigerant high pressure switch -F118-
Function
- Switches A/C clutch -N25- OFF if system pressure is too high.





A/C refrigerant low pressure switch -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.
- For switching pressures and removing and installing switch.





A/C system switches, valve connection
- A Schrader valve is installed under the A/C system switches so the switches can be replaced without discharging the A/C system.
- A/C system low and high pressure switches use different size threads.
- Use only the correct switches and O-rings specified for use with R-134a refrigerant and PAG oil.

A - Switch connection (soldered)
B - O-ring
C - Schrader valve insert




A/C compressor speed sensor -G111-
- Inductive sensor (4 pulses per compressor rotation)
- Determines A/C compressor speed; the A/C compressor clutch control module (manual A/C) or the A/C control head (automatic climate control) compares compressor speed to engine speed and calculates belt slippage (as a percentage) and switches compressor OFF if slippage is too lame (for example, if belt is too loose.)