Four Seasons 20890 HVAC Cut-Off Switch

Low Pressure A/C Cut-Off Switch for Jaguar XJS

The Four Seasons 20890 is a system-mounted HVAC cut-off switch built for low-pressure A/C control. It uses a black plastic and metal body, an open connector shape, and a 2-terminal layout for direct pressure-switch service on the HVAC system.

Compatible with Jaguar XJS applications from 1985-1989 and 1993-1996, this Four Seasons Pressure Switch line part is a practical OE-style replacement for low cut-out operation. The Four Seasons 20890 meets or exceeds OEM requirements and uses a male 1/8 in. pipe thread connection.

Key Features

• Four Seasons Pressure Switch line, part number 20890
• HVAC cut-off switch with low cut-out function
• System-mounted design for HVAC pressure control
• Black plastic / metal construction
• Open connector shape with 2 terminals
• Male fitting with 1/8 in. pipe thread size (13/32 x 27)
• Meets or exceeds OEM specifications

Product Details

This pressure switch is used in the HVAC system to monitor low-side pressure and trigger cut-off operation when pressure drops outside the expected range. For Jaguar XJS models, the Four Seasons 20890 supports low pressure A/C cut-off service on 1985-1989 and 1993-1996 vehicles, making it a focused replacement for the original system-mounted switch. This part cross-references A06984 and JLM1260 for the same application.

Common Issues This Part Can Address

• A/C compressor cycling caused by low-pressure switch failure
• Compressor cut-off concerns related to HVAC pressure sensing
• Intermittent A/C operation from worn switch contacts
• Fault codes or system interruptions tied to pressure-switch malfunction
• Loss of low-pressure protection in the HVAC circuit

Installation Notes and Tips

Install the switch on the HVAC system at the specified pressure-switch location and verify the male 1/8 in. pipe thread connection matches the original port. Confirm connector style, terminal count, and system mounting location before installation. After replacement, check A/C operation and inspect for proper compressor cut-off response under low-pressure conditions.

Quality Assurance

The Four Seasons 20890 is built to meet or exceed OEM requirements for pressure-switch service. Four Seasons Pressure Switch components are specified for HVAC repair applications where accurate low-pressure cut-out control is required.