Dorman 904-624 HVAC Pressure Switch

Overview of Dorman 904-624 HVAC Pressure Switch

The Dorman 904-624 HVAC Pressure Switch is designed for specific GM vehicles including Buick, Chevrolet, GMC, Oldsmobile, and Pontiac models. This pressure switch is engineered to monitor refrigerant pressure in R134a air conditioning systems, ensuring proper HVAC operation and system protection.

• Operates at 13 volts for reliable electrical performance
• Compatible with R134a refrigerant systems
• Pressure limits: closes at 26 psi and opens at 46 psi
• Maximum pressure rating up to 500 psi
• Durable metal housing with screw-on mount type
• Black circular female connector with two male blade terminals
• Thread diameter of 7/16-20 for secure installation
• Amperage rating of 4 amps for system safety

Detailed Product Description

The Dorman 904-624 HVAC Pressure Switch is a specific fit replacement part designed to maintain optimal pressure levels within the air conditioning system of select GM vehicles. It features a robust metal housing and a screw-on mount type that ensures a secure and stable installation. The switch operates at 13 volts and is calibrated to close at 26 psi and open at 46 psi, providing precise control over the refrigerant pressure in R134a systems. Its maximum pressure reading capability of 500 psi allows it to handle high-pressure conditions without failure. The black circular female connector with two male blade terminals facilitates a reliable electrical connection, while the 7/16-20 thread diameter matches OEM specifications for a proper fit.

Compatible Vehicles and Applications

This HVAC pressure switch is compatible with a range of GM vehicles, including:

• Buick Regal
• Chevrolet Blazer, C1500, C1500 Suburban, C2500, C2500 Suburban, C3500, Silhouette, Trans Sport
• GMC Jimmy, K1500, K1500 Suburban, K2500, K2500 Suburban, K3500, Yukon
• Oldsmobile Silhouette
• Pontiac Trans Sport

Use this part to maintain proper air conditioning system pressure and prevent system damage in these specific models.

Common Issues Addressed by the Dorman 904-624 HVAC Pressure Switch

• Prevents compressor damage caused by abnormal refrigerant pressure
• Stops system operation when pressure is too low or too high
• Helps maintain consistent cabin cooling performance
• Protects against electrical faults with a 4 amp amperage rating
• Ensures accurate pressure monitoring in R134a refrigerant systems

Installation Notes and Tips

Installation requires a screw-on mount with a 7/16-20 thread diameter. Ensure the vehicle’s air conditioning system is depressurized before removal and installation to avoid injury or damage. The black circular female connector and two male blade terminals should be connected securely to maintain proper electrical contact. Verify compatibility with your specific Buick, Chevrolet, GMC, Oldsmobile, or Pontiac model before installation.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The 904-624 HVAC Pressure Switch is constructed with durable metal housing and tested for reliable performance under typical operating conditions. Warranty information is available through Dorman and should be confirmed at the time of purchase.