Four Seasons 20952 A/C Trinary Switch

Four Seasons 20952 Trinary Pressure Switch

The Four Seasons Pressure Switch 20952 is a system-mounted A/C trinary switch built for 12-volt HVAC systems. It uses a 4-terminal pin connector with a male gray Weather Pack-style connection and a steel body for dependable electrical and pressure control in the air conditioning circuit.

Compatible With Mazda 3, Mazda 5, Mazda 6, Mazda CX-7, Mazda 2, and Acura NSX applications that use a 3/8" x 24 male threaded, system-mounted trinary pressure switch. Four Seasons 20952 is an OE-style replacement for vehicles that need compressor and fan pressure monitoring in one switch.

Key Features

• Brand: Four Seasons Pressure Switch line
• Part number: 20952
• Type: A/C trinary switch
• System-mounted design for HVAC pressure control
• 12-volt electrical specification
• 4 terminals with pin-style connection
• Male connector and male fitting
• 3/8" x 24 fitting thread size
• Steel construction with gray housing
• Weather Pack connection
• Meets or exceeds OEM requirements

Product Details

This Four Seasons Pressure Switch is used in automotive air conditioning systems to monitor refrigerant pressure and help manage compressor and fan operation. The trinary design combines pressure-switch functions in one component, making it a direct-fit service part for select Mazda and Acura platforms. If you are replacing a failed A/C pressure switch on a 2004-2009 Mazda 3, 2006-2010 Mazda 5, 2006-2007 Mazda 6, 2007-2008 Mazda CX-7, 2011-2014 Mazda 2, or 1994-2005 Acura NSX, part number 20952 is the correct reference to verify.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Address

• A/C compressor cycling problems caused by a faulty pressure switch
• Cooling fan control issues tied to refrigerant pressure signals
• Intermittent air conditioning operation from worn switch contacts
• Electrical connection problems at the HVAC pressure switch
• Pressure-related shutdowns in the A/C system

Installation Notes and Tips

Verify the fitting thread size, connector style, terminal count, and system-mounted location before installation. Match the vehicle application by year, make, and model, and confirm the switch orientation against the original part. For Mazda 3, Mazda 5, Mazda 6, Mazda CX-7, Mazda 2, and Acura NSX fitments, compare the existing switch to Four Seasons 20952 before service.

Quality Assurance

Four Seasons lists this pressure switch as meeting or exceeding OEM requirements, making it a service replacement built to align with original equipment specifications.