Vintage Air Trinary Switch Wiring Diagram

By | August 3, 2022



When it comes to vintage vehicle air conditioning systems, the wiring of the trinary switch can be a bit confusing. A trinary switch controls the compressor clutch, the cooling fan, and the liquid line solenoid valve. The switch will be connected to either the low pressure or high-pressure ac service port of the evaporator core. This switch will have three circuits and each circuit has its own pressure setting.

The first circuit is usually used for the compressor clutch, the second circuit for the cooling fan, and the third circuit for the liquid line solenoid valve. The trinary switch allows the driver to maintain their desired temperature by controlling the pressure in each circuit. By adjusting the pressures in these three circuits, the driver can control the amount of cooling and heating that they desire from the air conditioning system.

Having a wiring diagram of the trinary switch is very helpful for any vintage vehicle owner. It allows you to quickly identify any faulty wires or connections that may cause problems with the air conditioning system. Understanding how each circuit works and how to wire them correctly is also incredibly important. This helps to ensure that the air conditioning system is working efficiently and can provide a comfortable ride all year round. Taking the time to review and understand the wiring diagram of the trinary switch can save you a lot of time and hassle in the long run.


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