Four Seasons 36668 HVAC Cut-Off Switch
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Four Seasons
 Pressure Switch

Four Seasons 36668 HVAC Cut-Off Switch

Brand Four Seasons ES2012S
Length 5.5
Product line Pressure Switch
Fits —66 vehicles

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

Pressure switch. System-mounted cut-off switch for precise HVAC pressure control.

Two-terminal design. Round male connector and female fitting for straightforward hookup.

Cross-references Four Seasons 33997, Four Seasons 36668 and Global Parts Distributors LLC 1711434 for the same application. See all 24.

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Four Seasons 36668 Pressure Switch Overview

Four Seasons 36668 is a system-mounted HVAC low cut-out pressure switch for A/C systems that use a 7/16 in. x 20 female thread connection and a round male 2-terminal connector. This black pressure switch meets or exceeds OEM requirements and is built for direct replacement service on select Buick, Cadillac, and Oldsmobile applications.

Use this Four Seasons Pressure Switch when you need a low pressure A/C cut-off switch for vehicles such as the Buick Riviera, Cadillac DeVille, and Oldsmobile Toronado. The Four Seasons 36668 is also cross-referenced to common aftermarket numbers for the same application.

Key Features

  • Low cut-out HVAC pressure switch for A/C system protection
  • System-mounted design for direct installation on the HVAC system
  • Black housing with round male connector and 2 terminals
  • Female fitting thread size: 7/16 in. x 20
  • Meets or exceeds OEM specifications
  • Four Seasons Pressure Switch line for replacement HVAC service

Detailed Product Description

Four Seasons 36668 is a pressure-operated HVAC cut-off switch used to monitor low refrigerant pressure and signal the A/C system when pressure drops below the operating threshold. Its open contact configuration, round connector shape, and system-mounted layout make it a direct-fit replacement for select GM vehicles that require a low pressure A/C cut-off switch. This part number is commonly searched as Four Seasons 36668 pressure switch, HVAC cut-off switch 36668, and low pressure A/C switch for Buick Riviera, Cadillac DeVille, and Oldsmobile Toronado applications.

This part cross-references Hayden 5066 and UAC SW1135C for the same application.

What It Helps Address

  • A/C compressor cycling caused by low refrigerant pressure
  • HVAC system shutdown from a failed low pressure cut-off switch
  • Intermittent A/C operation related to pressure switch contact issues
  • Incorrect pressure signal to the HVAC control circuit
  • Replacement needs on select Buick, Cadillac, and Oldsmobile A/C systems

Installation Notes and Tips

Install the switch on the HVAC system at the original mounting location and verify the connector style, thread size, and terminal count before installation. Confirm the vehicle uses a low pressure A/C cut-off switch with a 7/16 in. x 20 female fitting and round male connector. For fitment verification, this part is listed for 1986-1993 Buick Riviera, 1987-1993 Cadillac DeVille, and 1986-1992 Oldsmobile Toronado, along with additional Cadillac and Buick applications in the same model years.

  • Fits 1986-1993 Buick Riviera, N/A
  • Fits 1987-1993 Cadillac DeVille, N/A
  • Fits 1986-1992 Oldsmobile Toronado, N/A
  • Fits 1986-1993 Cadillac Eldorado, N/A
  • Fits 1986-1993 Cadillac Fleetwood, N/A
  • Fits 1986-1993 Cadillac Seville, N/A
  • Fits 1987-1992 Cadillac Brougham, N/A
  • Fits 1988-1991 Buick Reatta, N/A
  • Fits 1989-1993 Cadillac Commercial Chassis, N/A

Quality Assurance

Four Seasons manufactures this pressure switch to meet or exceed OEM specifications for HVAC service applications. The Four Seasons Pressure Switch line is built for replacement use in systems that require accurate low pressure cut-off control.

Related reading

This part fits 66 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelSubmodelPositionNotes
1993BuickRiviera—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1993CadillacCommercial ChassisBroughamN/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1993CadillacDeVille—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1993CadillacEldorado—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1993CadillacFleetwood—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1993CadillacSeville—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1992BuickRiviera—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1992CadillacBrougham—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1992CadillacCommercial ChassisBroughamN/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1992CadillacDeVille—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1992CadillacEldorado—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1992CadillacFleetwood—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1992CadillacSeville—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1992OldsmobileToronado—N/ALow Pressure A/C System Mounted Liquid Line - HVAC Cut-Off Switch; Pressure Switch
1991BuickReatta—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1991BuickRiviera—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1991CadillacBrougham—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1991CadillacDeVille—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1991CadillacEldorado—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1991CadillacFleetwood—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1991CadillacSeville—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1991OldsmobileToronado—N/ALow Pressure A/C System Mounted Liquid Line - HVAC Cut-Off Switch; Pressure Switch
1990BuickReatta—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1990BuickRiviera—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1990CadillacBrougham—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1990CadillacCommercial Chassis—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1990CadillacDeVille—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1990CadillacEldorado—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1990CadillacFleetwood—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1990CadillacSeville—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1990OldsmobileToronado—N/ALow Pressure A/C System Mounted Liquid Line - HVAC Cut-Off Switch; Pressure Switch
1989BuickReatta—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1989BuickRiviera—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1989CadillacBrougham—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1989CadillacCommercial Chassis—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1989CadillacDeVille—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1989CadillacEldorado—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1989CadillacFleetwood—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1989CadillacFleetwoodBaseN/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1989CadillacFleetwoodd'EleganceN/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1989CadillacFleetwood60 SpecialN/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1989CadillacFleetwoodBrougham Commercial ChassisN/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1989CadillacSeville—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1989OldsmobileToronado—N/ALow Pressure A/C System Mounted Liquid Line - HVAC Cut-Off Switch; Pressure Switch
1988BuickReatta—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1988BuickRiviera—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1988CadillacBrougham—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1988CadillacDeVille—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1988CadillacEldorado—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1988CadillacFleetwood—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1988CadillacSeville—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1988OldsmobileToronado—N/ALow Pressure A/C System Mounted Liquid Line - HVAC Cut-Off Switch; Pressure Switch
1987BuickRiviera—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1987CadillacBrougham—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1987CadillacDeVille—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1987CadillacEldorado—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1987CadillacFleetwood—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1987CadillacSeville—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1987OldsmobileToronado—N/ALow Pressure A/C System Mounted Liquid Line - HVAC Cut-Off Switch; Pressure Switch
1986BuickRiviera—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1986CadillacEldorado—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1986CadillacFleetwoodBaseN/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1986CadillacFleetwood75N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1986CadillacFleetwood75 FormalN/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1986CadillacSeville—N/AMount the Low Pressure A/C Cut-Off Switch on the HVAC system.; Pressure Switch
1986OldsmobileToronado—N/ALow Pressure A/C System Mounted Liquid Line - HVAC Cut-Off Switch; Pressure Switch
Directly replaces or cross-references 24 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Four Seasons — 33997Four Seasons — 36668Global Parts Distributors LLC — 1711434Hayden — 5066UAC — SW1135C1102501524902076182117392127397018189046230147862416313992930404713666811136668V25528471A6416AC8705ACD152490HS739MT0643SW1135