Four Seasons 37819 HVAC Cut-Off Switch

Four Seasons 37819 HVAC Cut-Off Switch

The Four Seasons 37819 pressure switch is a system-mounted HVAC cut-off switch built for low-pressure control in automotive air conditioning systems. It uses a black plastic and metal body with a female oval connector and 2 terminals for a direct replacement style installation.

For drivers searching for an HVAC pressure switch for Ford F-150, Chevy Silverado, or Dodge Ram applications, this Four Seasons Pressure Switch line provides an OE-style solution that meets or exceeds OEM requirements. The 37819 part number is also a useful cross-reference when comparing low cut-out pressure switch replacements.

Key Features

• Low cut-out HVAC pressure switch for system-mounted applications
• Operates at 40 psi on and 30 psi off
• Female oval connector with 2 terminals
• 7/16 in. x 20 female thread size
• Black plastic and metal construction
• Meets or exceeds OEM specifications

Detailed Description

The Four Seasons 37819 is a pressure-operated HVAC cut-off switch used to monitor refrigerant system pressure and control compressor operation. Its low cut-out design helps manage system pressure thresholds by opening and closing the circuit at the specified psi range, supporting proper A/C system function in vehicles that use a system-mounted pressure switch. If you are replacing a failed HVAC pressure switch on a Ford F-150, Chevy Silverado, or Dodge Ram, this part number 37819 is a direct reference point for the correct low-pressure switch style.

This Four Seasons Pressure Switch component is built with a female connector and oval plug shape for a secure electrical connection. The 7/16 in. x 20 female fitting thread size and 2-terminal layout make it a practical replacement for many automotive HVAC service needs. This part cross-references FEL-PRO 1427 for the same application.

Common Problems This Part Can Address

• Compressor cycling caused by incorrect low-side pressure readings
• A/C system shutdown from a failed pressure cut-off switch
• Intermittent compressor engagement due to worn switch contacts
• Electrical connection issues at the HVAC pressure switch connector
• Replacement needs for a leaking or damaged system-mounted switch

Installation Notes and Tips

Verify the connector style, thread size, and pressure operating range before installation. Match the existing system-mounted location and confirm the vehicle uses a low cut-out pressure switch with 40 psi on and 30 psi off specifications. Always inspect the HVAC connector and sealing surfaces during replacement to help ensure proper electrical contact and refrigerant system operation.

Quality Assurance

The Four Seasons 37819 is listed as meeting or exceeding OEM requirements, making it a dependable OE-style replacement for automotive HVAC service. Use the part number 37819 and the original switch specifications to confirm application details before ordering.