Dorman 904-622 HVAC Pressure Switch

Dorman 904-622 A/C Pressure Switch

Dorman 904-622 is a specific-fit HVAC pressure switch for R134A air conditioning systems. It replaces a failed transducer switch caused by corroded terminals or a damaged connector, helping restore A/C operation on select Volvo applications.

Key Features

• Specific-fit replacement HVAC pressure switch for select Volvo models
• Designed for R134A refrigerant systems
• 5-volt electrical rating with 3 blade terminals
• Black rectangular female connector with metal housing
• Bolt-on mount with 10 mm thread diameter
• Pressure limits: closed at 260 and open at 475
• Maximum pressure reading: 435 PSI

Detailed Description

This Dorman HVAC pressure switch is built as a direct replacement for the original A/C transducer switch used on select Volvo C70, S40, S70, V50, V70, and 850 applications. It is intended for systems that use R134A refrigerant and features a 5-volt design, 3 blade terminals, and a black rectangular connector for a factory-style electrical connection. Part number 904-622 is a practical replacement when the original switch has corroded terminals or a broken connector and the air conditioning system no longer operates correctly. This part cross-references Four Seasons 37370 for the same application.

What It Can Help Fix

• Air conditioning that stops cycling or responding correctly
• Faults caused by corroded electrical terminals
• Problems related to a broken or damaged connector on the original switch
• Incorrect pressure signal from a worn A/C transducer switch
• Loss of A/C function on select Volvo HVAC systems

Installation Notes and Tips

Verify the connector shape, terminal count, thread diameter, and refrigerant type before installation. This is a bolt-on pressure switch with a 10 mm thread diameter and no mounting bracket included. Confirm vehicle-specific fitment for your Volvo C70, S40, S70, V50, V70, or 850 application, and inspect the surrounding A/C wiring and connector condition during replacement.

Quality Assurance

Dorman manufactures replacement components for direct-fit service applications, and this HVAC pressure switch is built to match the original style and electrical configuration for the listed vehicles.