Dorman 904-617 HVAC Pressure Switch

Dorman 904-617 A/C Pressure Sensor

Restore air conditioning performance with this Dorman HVAC pressure switch for R134A systems. The 5-volt transducer-style sensor is a direct replacement for a damaged original unit, helping address corroded terminals or a broken connector that can interrupt A/C operation.

Compatible with a wide range of GM vehicles, including Chevrolet Trailblazer, GMC Envoy, Pontiac Grand Prix, and Chevrolet Corvette applications, this Dorman 904-617 pressure sensor is built for specific-fit replacement use.

Key Features

• Direct replacement HVAC pressure switch for R134A air conditioning systems
• 5-volt sensor with 3-pin male terminals and female round connector
• Specific-fit design with bolt-on mounting and 10 mm thread diameter
• Metal housing with black connector and black body finish
• Pressure limits: closed at 260 and open at 475
• Maximum pressure reading of 507 PSI
• Cross-reference part numbers include Four Seasons 36698 and interchange 9131721

Detailed Description

This HVAC pressure switch is designed to restore A/C system function when the original sensor fails due to electrical damage, corrosion, or connector issues. Dorman 904-617 is a direct replacement A/C transducer switch for specific GM applications, helping the system read refrigerant pressure correctly so the air conditioning can operate as intended. It is built for R134A refrigerant systems and uses a 5-volt signal with a round female connector and three male terminals. This part cross-references Four Seasons 36698 for the same application.

What It Helps Fix

• Air conditioning that stops working because the pressure sensor is no longer sending a proper signal
• Corroded or damaged terminals at the original HVAC pressure switch
• Broken connector issues at the A/C transducer switch
• Incorrect pressure readings that can prevent compressor operation
• Intermittent A/C performance on GM vehicles such as Chevrolet Trailblazer and Pontiac Grand Prix

Installation Notes and Tips

Verify refrigerant type, connector style, thread diameter, and pressure specifications before installation. This sensor mounts with a bolt-on design and uses a 10 mm thread diameter. Confirm the vehicle uses an R134A system and match the connector shape and terminal count to the original part before replacement. Fits 2002-2005 Chevrolet Trailblazer, N/A; Fits 2002-2005 GMC Envoy, N/A; Fits 1994-2002 Pontiac Grand Prix, N/A; Fits 1994-2004 Chevrolet Corvette, N/A.

Quality Assurance

Dorman manufactures replacement components engineered to match original equipment fit and function for specific applications. Part number 904-617 is built as a direct replacement HVAC pressure sensor for the listed vehicles and system requirements.