Dorman 904-622 HVAC Pressure Switch

Overview of Dorman 904-622 HVAC Pressure Switch

The Dorman 904-622 HVAC Pressure Switch is designed specifically for select Volvo models, including the 850, C70, S40, S70, V50, and V70. This pressure switch ensures reliable monitoring of refrigerant pressure in your vehicle's air conditioning system, helping maintain optimal HVAC performance.

• Voltage: 5 volts for precise operation
• Compatible refrigerant type: R134a
• Pressure limits: Closes at 260 psi, opens at 475 psi
• Maximum pressure reading: 435 psi
• Connector: Black rectangular female connector with 3 male blade terminals
• Housing material: Durable metal construction
• Mount type: Bolt-on installation with 10 mm thread diameter
• Specific fitment for Volvo 850, C70, S40, S70, V50, and V70 models

Detailed Product Description

The Dorman 904-622 HVAC Pressure Switch is engineered to monitor refrigerant pressure within the air conditioning system of compatible Volvo vehicles. Operating at 5 volts, this switch is calibrated to close at 260 psi and open at 475 psi, with a maximum pressure reading of 435 psi, ensuring accurate pressure regulation. Its metal housing provides durability and resistance to environmental factors, while the black rectangular female connector with three male blade terminals facilitates secure electrical connections. The bolt-on mount type with a 10 mm thread diameter allows for straightforward installation in the designated locations on Volvo 850, C70, S40, S70, V50, and V70 models.

Common Applications and Issues Addressed

• Prevents compressor damage by monitoring refrigerant pressure
• Helps maintain consistent air conditioning system performance
• Protects against system overpressure or underpressure conditions
• Resolves HVAC system shutdowns caused by faulty pressure sensing
• Ensures proper cycling of the A/C compressor in Volvo vehicles

Installation Notes and Tips

• Ensure vehicle compatibility with Volvo 850, C70, S40, S70, V50, and V70 models before installation
• Disconnect the battery before replacing the pressure switch to avoid electrical shorts
• Use appropriate tools for bolt-on installation with 10 mm thread diameter
• Verify connector orientation and secure connection of the black rectangular female connector
• Check refrigerant levels and system pressure after installation for proper operation

Quality Assurance and Warranty

Dorman manufactures the 904-622 HVAC Pressure Switch to meet or exceed OEM specifications for fit, form, and function. The metal housing and precise pressure calibration contribute to long-term reliability in Volvo HVAC systems. This part comes with a limited warranty to cover defects in materials and workmanship, providing confidence in its performance and durability.