Dorman 904-625 HVAC Pressure Switch

Reliable HVAC Pressure Switch for Chevrolet and GMC Vehicles

The Dorman 904-625 HVAC Pressure Switch is designed specifically for select Chevrolet and GMC models, including Blazer, C1500, and Yukon. This pressure switch ensures accurate monitoring of your vehicle's air conditioning system pressure, helping maintain optimal HVAC performance.

• Operates at 13 volts for consistent electrical performance
• Compatible with R134a refrigerant systems
• Pressure limits: closes at 21 psi and opens at 44 psi
• Maximum pressure rating up to 500 psi for durability
• Features a black circular female connector with two male blade terminals
• Constructed with durable plastic and steel housing materials
• Specific fit for Chevrolet and GMC models, including Blazer, C1500, and Yukon
• Screw-on mount type with 7/16-20 thread diameter

Product Details and Specifications

The Dorman 904-625 HVAC Pressure Switch is engineered to monitor refrigerant pressure within your vehicle’s air conditioning system accurately. Designed for use with R134a refrigerant, this switch activates or deactivates the compressor based on pressure thresholds—closing at 21 psi and opening at 44 psi—to protect the system from damage due to abnormal pressure levels. The switch operates at 13 volts and supports an amperage rating of 4.2 amps, ensuring reliable electrical compatibility with your vehicle’s HVAC system.

Its housing combines plastic and steel materials for strength and resistance to environmental factors. The black circular female connector with two male blade terminals provides secure electrical connections. The screw-on mount with a 7/16-20 thread diameter allows for straightforward installation on compatible vehicles.

Compatible Chevrolet and GMC Models

This HVAC pressure switch is specifically designed for the following Chevrolet and GMC vehicles:

• Chevrolet Blazer
• Chevrolet C1500 and C1500 Suburban
• Chevrolet C2500 and C2500 Suburban
• Chevrolet C3500
• Chevrolet Jimmy
• Chevrolet K1500 and K1500 Suburban
• Chevrolet K2500 and K2500 Suburban
• Chevrolet K3500
• Chevrolet Yukon

Common HVAC Issues Addressed by This Pressure Switch

• Prevents compressor damage caused by low or high refrigerant pressure
• Helps maintain proper air conditioning system cycling
• Protects against system overpressure conditions
• Ensures reliable compressor engagement and disengagement
• Improves overall HVAC system efficiency and longevity

Installation Notes and Tips

Installation requires removing the old pressure switch and screwing on the Dorman 904-625 switch using the 7/16-20 thread. Ensure the electrical connector matches the black circular female connector on the switch. No mounting bracket is included, so use the existing mounting hardware. Verify system pressure is relieved before removal to avoid injury or damage.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM specifications for fit and function. The 904-625 HVAC Pressure Switch undergoes rigorous quality control to ensure durability and reliable operation. Please refer to Dorman’s warranty policy for specific coverage details.