Help protect your air conditioning system with the Four Seasons switch, part number 20952, a system-mounted trinary pressure switch that monitors refrigerant pressure and switches the A/C compressor and cooling fan circuits in response. It fits many vehicles, among them the 2011-2014 Mazda 2, 2006-2010 Mazda 5 and 2007-2008 Mazda CX-7, and is a direct-fit replacement for the listed applications. See the "Vehicles it fits" section for the full list.
A trinary switch typically does three jobs in one unit: a low-pressure cutout, a high-pressure cutout, and a mid-pressure signal used for condenser fan control. If a failed trinary switch is behind a compressor that won't engage, an A/C that cuts out, or a fan that doesn't switch on, this unit replaces it. Diagnose the system first, because refrigerant level and wiring can cause the same signs.
- Corrosion protection: zinc coated to resist corrosion.
- Vehicle-specific: built for the listed applications.
- Sealing parts supplied: comes with the gaskets, O-rings or seals needed to properly replace the switch.
- Easy to identify: color coded for quick identification.
Four Seasons engineers and tests its A/C components, drawing on over 50 years of mobile air conditioning experience.
Interchange: 1551028 · 207764 · 11120952 · 19188176 · 1711678 · B01A61503 · GB6M61503 · A07764 · MT0620 · SW11149 · SW11149C
This part cross-references / interchanges with the following part numbers:
1551028, 207764, 20952, 11120952, 19188176, 1711678, B01A61503, GB6M61503, A07764, MT0620, SW11149, SW11149C
Frequently Asked Questions
What does an A/C trinary switch do?
It monitors A/C refrigerant pressure. A trinary switch typically combines low- and high-pressure compressor cutouts with a mid-pressure signal used to control the condenser fan.
Does this Four Seasons trinary switch fit the 2011-2014 Mazda 2?
Yes. The 2011-2014 Mazda 2 is a listed application, along with the 2006-2010 Mazda 5 and 2007-2008 Mazda CX-7. Check the "Vehicles it fits" section to confirm your exact vehicle.
What comes with the switch?
The switch comes with the gaskets, O-rings or seals needed to properly replace it.
What are signs the trinary switch may need replacing?
Possible signs are a compressor that won't engage or cycles erratically, A/C that cuts out, or a condenser fan that doesn't switch on. Low refrigerant or wiring faults can cause the same signs, so diagnose first.
Is the switch protected against corrosion?
Yes. It is zinc coated to resist corrosion, and it is color coded for easy identification.
