Buick Century AC Cycling Switch Replacement at your home or office.

What is the AC Pressure Switch all about?

Your car’s air conditioning system uses a refrigerant that takes on different characteristics at different pressures. Under low pressure, the refrigerant is a gas. Under high pressure, it’s a liquid. This means there are technically two “sides” to the AC system – the high pressure side and the low pressure side. Both sides must monitor pressure to ensure safe operation. One of the safety features built into modern air conditioning systems is a pressure switch – the AC low pressure switch is designed to trip if there’s a pressure-related issue on the low side, and the high pressure switch on the high side.

The AC pressure switch basically turns a side of the system off if certain events take place. There are numerous causes of low or high pressure switch tripping, and not all of them involve switch failure. A low refrigerant charge can cause the low pressure switch to read incorrectly. The same goes for a high refrigerant charge.