Four Seasons 36678 HVAC Cut-Off Switch

Overview of Four Seasons Pressure Switch 36678

The Four Seasons Pressure Switch 36678 is designed for reliable HVAC system control in select Cadillac models. This system-mounted pressure switch helps regulate high cut-out pressure to maintain optimal air conditioning performance in Cadillac DeVille, Eldorado, and Seville vehicles.

• Compatible with Cadillac DeVille, Eldorado, and Seville models
• High cut-out style pressure switch with operate psi high on at 225 and off at 420
• Female connector and fitting with 10mm x 1.25 thread size
• Durable plastic and metal construction with Weather Pack terminals
• Includes one item 24606 for complete installation
• 12-volt operation with two pin terminals
• Meets or exceeds OEM specifications for reliable performance

Four Seasons Pressure Switch Product Line Details

The Four Seasons Pressure Switch product line focuses on precision pressure control components for automotive HVAC systems. This line includes pressure switches engineered to provide accurate system cut-off and cut-in points, ensuring proper compressor operation and system protection. The 36678 model exemplifies this with its high cut-out style and system-mounted design, tailored for specific Cadillac applications.

Technical Description and Features

The Four Seasons Pressure Switch 36678 is a pressure-activated HVAC cut-off switch constructed from a combination of plastic and metal materials for durability. It features a closed compressor open/closed state and operates at 12 volts. The switch uses a female connector and fitting, both with a 10mm x 1.25 thread size, and includes two pin-type terminals with Weather Pack compatibility for secure electrical connections. The switch activates at a high pressure of 225 psi and deactivates at 420 psi, providing precise control to protect the HVAC system from overpressure conditions. This part is system-mounted for direct integration into the vehicle's air conditioning system.

Common Applications and Problem Resolution

• Prevents compressor damage due to excessive system pressure
• Helps maintain consistent air conditioning performance in Cadillac DeVille, Eldorado, and Seville
• Resolves HVAC system cut-off failures related to faulty pressure switches
• Addresses issues with compressor cycling caused by incorrect pressure sensing
• Ensures proper system shutoff to avoid refrigerant leaks or component wear

Installation Notes and Tips

When installing the Four Seasons Pressure Switch 36678, ensure the system is depressurized and the vehicle is off. The switch should be mounted securely in the system location specified for Cadillac DeVille, Eldorado, or Seville models. Use the included item 24606 for proper fitting and thread engagement. Verify the female connector and fitting thread size (10mm x 1.25) match the vehicle’s specifications. Confirm electrical connections are made to the two pin terminals with Weather Pack compatibility to prevent moisture intrusion and ensure reliable operation.

Quality Assurance and Warranty

This Four Seasons Pressure Switch 36678 meets or exceeds OEM standards for fit, form, and function. Manufactured with quality plastic and metal materials, it is designed for durability and consistent performance in automotive HVAC systems. The part is backed by Four Seasons’ quality assurance protocols, ensuring compatibility with Cadillac DeVille, Eldorado, and Seville models. Warranty details should be confirmed with the product documentation or supplier.