Four Seasons A/C Trinary Switch 37552
Four Seasons A/C Trinary Switch 37552

Four Seasons A/C Trinary Switch P/N:37552

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$173.99
MPN: 37552
Item Package Quantity: 1
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Four Seasons A/C Trinary Switch P/N:37552
Four Seasons A/C Trinary Switch P/N:37552
$173.99

Protect your A/C compressor and keep the cooling fan cycling on cue with the Four Seasons A/C Trinary Switch 37552. This pressure switch installs as a direct-fit replacement on the 2001-2006 Hyundai Elantra, 1999-2005 Hyundai Sonata, 2003-2008 Hyundai Tiburon, 2005-2009 Hyundai Tucson, 2001 Hyundai XG300, 2002-2005 Hyundai XG350, 2001-2005 Kia Optima, and 2002 Kia Sedona.

A trinary switch monitors refrigerant pressure on the high side and manages three functions from a single unit:

  • Low-pressure cutout: designed to disengage the compressor clutch when system pressure drops too low, helping protect the compressor from running without adequate refrigerant.
  • High-pressure cutout: intended to open the clutch circuit when pressure climbs too high, guarding against over-pressurization.
  • Fan control: signals the condenser cooling fan to switch on at elevated pressure to aid heat rejection.

If a faulty trinary switch is the cause of an A/C clutch that won't engage or a condenser fan that won't cycle, this replaces it. Diagnose the cause before replacing, as these symptoms can have other sources.

Interchange: 1S9240 · 1S9241 · 1711763 · 1711764 · 977522D000 · 9775238000 · 9775238001 · 201152 · A01152 · MT0816 · MT0818 · SW11460C · SW6701

This part cross-references / interchanges with the following part numbers:

1S9240, 1S9241, 37552, 1711763, 1711764, 977522D000, 9775238000, 9775238001, 977523A000, 201152, A01152, MT0816, MT0818, SW10084C, SW11460C, SW6701, SW6702

Frequently Asked Questions

What does a trinary switch do?

It monitors high-side refrigerant pressure and performs three jobs: disengaging the compressor clutch at low pressure, cutting the clutch at excessively high pressure, and switching on the condenser cooling fan at elevated pressure.

Which vehicles does the Four Seasons 37552 fit?

It is a direct-fit replacement for applications including the Hyundai Elantra, Sonata, Tiburon, Tucson, XG300 and XG350, plus the Kia Optima and Sedona. See the Buyer's Guide tab for the full year-by-year list.

What are signs this switch may need replacing?

An A/C compressor clutch that won't engage or a condenser cooling fan that won't cycle can be signs of a failed trinary switch. Diagnose the cause first, since these symptoms can have other sources.

What numbers does this switch cross-reference?

It interchanges with 1S9240, 1S9241, 1711763, 1711764, 977522D000, 9775238000, 9775238001, 201152, A01152, MT0816, MT0818, SW11460C, SW6701 and SW6702.

Will replacing this switch fix my A/C?

If a faulty trinary switch is the cause, replacing it addresses that function; however, clutch or fan issues can stem from other components, so confirm the diagnosis before installing.

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