Four Seasons 36678 HVAC Cut-Off Switch
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Four Seasons
 Pressure Switch

Four Seasons 36678 HVAC Cut-Off Switch

Brand Four Seasons 36678
Comp Open/Closed Closed
Connector Gender Female
Description Switch-Pressure /System Mount
Fitting Gender Female
Fitting Thread Size 10mm x 1.25
Item Included A Desc 24606
Item Included A Qty. 1
Material Plastic / Metal
Meets / Exceeds OEM? YES
Mnt Sys Loc System Mounted
Number of Terminals 2
Off Pressure 420
Operate Psi High Off 420
Operate Psi High On 225
Style High Cut-Out
Terminal Type Pin
Type Pressure
Voltage 12
Weather Pack? Yes
Product line Pressure Switch
Fits Cadillac · 20 vehicles

OE direct replacement. Meets or exceeds OEM requirements for dependable system control.

High cut-out design. Helps regulate pressure with precise on and off points.

Weather-pack sealed. Built with a sealed connector for added protection.

Cross-references AMS Automotive 4972, Four Seasons 36678 and Global Parts Distributors LLC 1711744 for the same application. See all 16.

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Four Seasons 36678 HVAC Cut-Off Switch

Four Seasons 36678 is a system-mounted HVAC cut-off switch for high-pressure A/C protection. This pressure switch uses a 12-volt, 2-terminal pin connection with a female connector and 10mm x 1.25 female fitting for direct service replacement on the listed Cadillac applications.

Key Features

  • High cut-out pressure switch for HVAC system pressure control
  • System-mounted design with 10mm x 1.25 female fitting
  • 12V electrical specification with 2-pin terminal layout
  • Closed-comp operation
  • Plastic and metal construction
  • Weather Pack connection for sealed electrical performance
  • Meets or exceeds OEM requirements

Product Details

The Four Seasons Pressure Switch line focuses on HVAC pressure control components used to monitor refrigerant system pressure and interrupt compressor operation at the specified threshold. Part number 36678 is a high cut-out switch with an off pressure of 420 psi and an on pressure of 225 psi, making it a direct-fit service part for pressure-based A/C system protection. This Four Seasons 36678 pressure switch is listed for 1994-2002 Cadillac Eldorado, 1994-2000 Cadillac DeVille, and 1994-1997 Cadillac Seville.

This part cross-references UAC SW11159C for the same application.

What It Helps Address

  • A/C compressor cycling caused by incorrect high-side pressure readings
  • HVAC shutdown triggered by a failed pressure switch
  • Loss of compressor protection in high-pressure conditions
  • Intermittent electrical connection at the pressure switch circuit
  • Service replacement needs on Cadillac Eldorado, DeVille, and Seville HVAC systems

Installation Notes and Tips

Verify the connector style, thread size, and pressure specification before installation. This switch is system mounted and uses a female connector with pin terminals, so the existing harness and fitting must match the listed configuration. Confirm the vehicle’s A/C system pressure diagnosis before replacing the switch, and inspect the connector seal and surrounding refrigerant components during service.

Quality Assurance

Four Seasons states that this pressure switch meets or exceeds OEM requirements. The part is built with plastic and metal materials and uses a Weather Pack connection for sealed electrical performance.

Related reading

This part fits 20 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelPositionNotes
2002CadillacEldoradoN/AFitment Note: HVAC Cut-Off Switch for High Pressure A/C System Mounted; Pressure Switch
2001CadillacEldoradoN/AFitment Note: HVAC Cut-Off Switch for High Pressure A/C System Mounted; Pressure Switch
2000CadillacDeVilleN/AFitment Note: HVAC Cut-Off Switch for High Pressure A/C System Mounted; Pressure Switch
2000CadillacEldoradoN/AFitment Note: HVAC Cut-Off Switch for High Pressure A/C System Mounted; Pressure Switch
1999CadillacDeVilleN/AFitment Note: HVAC Cut-Off Switch for High Pressure A/C System Mounted; Pressure Switch
1999CadillacEldoradoN/AFitment Note: HVAC Cut-Off Switch for High Pressure A/C System Mounted; Pressure Switch
1998CadillacDeVilleN/AFitment Note: HVAC Cut-Off Switch for High Pressure A/C System Mounted; Pressure Switch
1998CadillacEldoradoN/AFitment Note: HVAC Cut-Off Switch for High Pressure A/C System Mounted; Pressure Switch
1997CadillacDeVilleN/AFitment Note: HVAC Cut-Off Switch for High Pressure A/C System Mounted; Pressure Switch
1997CadillacEldoradoN/AFitment Note: HVAC Cut-Off Switch for High Pressure A/C System Mounted; Pressure Switch
1997CadillacSevilleN/AFitment Note: HVAC Cut-Off Switch for High Pressure A/C System Mounted; Pressure Switch
1996CadillacDeVilleN/AFitment Note: HVAC Cut-Off Switch for High Pressure A/C System Mounted; Pressure Switch
1996CadillacEldoradoN/AFitment Note: HVAC Cut-Off Switch for High Pressure A/C System Mounted; Pressure Switch
1996CadillacSevilleN/AFitment Note: HVAC Cut-Off Switch for High Pressure A/C System Mounted; Pressure Switch
1995CadillacDeVilleN/AFitment Note: HVAC Cut-Off Switch for High Pressure A/C System Mounted; Pressure Switch
1995CadillacEldoradoN/AFitment Note: HVAC Cut-Off Switch for High Pressure A/C System Mounted; Pressure Switch
1995CadillacSevilleN/AFitment Note: HVAC Cut-Off Switch for High Pressure A/C System Mounted; Pressure Switch
1994CadillacDeVilleN/AFitment Note: HVAC Cut-Off Switch for High Pressure A/C System Mounted; Pressure Switch
1994CadillacEldoradoN/AFitment Note: HVAC Cut-Off Switch for High Pressure A/C System Mounted; Pressure Switch
1994CadillacSevilleN/AFitment Note: HVAC Cut-Off Switch for High Pressure A/C System Mounted; Pressure Switch
Directly replaces or cross-references 16 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
AMS Automotive — 4972Four Seasons — 36678Global Parts Distributors LLC — 1711744UAC — SW11159C1528752078972118937018621113667825604950A77897AC8861ACD152875HS893MT0973SW11159