Four Seasons HVAC Binary Switch 20929
Four Seasons HVAC Binary Switch 20929 - view 2
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Four Seasons HVAC Binary Switch 20929
Four Seasons HVAC Binary Switch 20929 - view 2
Four Seasons HVAC Binary Switch 20929 - view 3
Four Seasons HVAC Binary Switch 20929 - view 4

Four Seasons HVAC Binary Switch P/N:20929

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$10.99
MPN: 20929
Item Package Quantity: 1
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Four Seasons HVAC Binary Switch P/N:20929
Four Seasons HVAC Binary Switch P/N:20929
$10.99

Help protect your A/C compressor from running outside its safe pressure range with the Four Seasons HVAC Binary Switch, part number 20929, a system-mounted binary pressure switch that monitors refrigerant pressure and signals the compressor to cut out when pressure is too low or too high. It fits many vehicles, among them the 1995-2016 Toyota Tacoma, 1996-2021 Toyota 4Runner and 2000-2016 Toyota Tundra, as a direct-fit replacement for the listed applications. See the Buyer's Guide tab for the full list.

Four Seasons engineers and tests its products and draws on more than 50 years of mobile A/C experience.

  • Corrosion resistance: zinc coated to resist corrosion.
  • Vehicle-specific: built for specific vehicle applications.
  • Sealing parts included: comes with the gaskets, O-rings or seals needed to properly replace the switch.
  • Color coded: easy to identify.

Signs a binary switch may need replacing include an A/C compressor that won't engage, rapid compressor cycling, or warm air from the vents. Low refrigerant or electrical faults can cause the same symptoms, so diagnose the system before you replace the switch. Follow the vehicle service information for the correct installation procedure, including any refrigerant handling it requires.

Frequently Asked Questions

What does an A/C binary pressure switch do?

It monitors A/C refrigerant pressure and opens the compressor circuit when pressure is too low or too high. This helps protect the compressor from running outside its safe range.

Is this a Tacoma 4wd switch?

No. Part 20929 is an A/C binary pressure switch, not a four-wheel-drive switch. It is a direct-fit replacement for the A/C system on the 1995-2016 Toyota Tacoma.

Which vehicles does the Four Seasons 20929 fit?

It fits many vehicles, including the 1996-2021 Toyota 4Runner and the 2000-2016 Toyota Tundra. Check the Buyer's Guide tab to confirm your exact vehicle.

What comes with the switch?

The 20929 comes with the gaskets, O-rings or seals needed to properly replace the switch. It is also color coded for easy identification.

What are signs the binary switch may be failing?

Signs include a compressor that won't engage, rapid on-off cycling, or warm air from the vents. Low refrigerant and wiring faults cause similar symptoms, so check those too.

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