Dorman 904-627 HVAC Pressure Switch

Dorman 904-627 HVAC Pressure Switch

Restore A/C system control with this Dorman HVAC pressure switch, part number 904-627. It is a direct replacement A/C transducer switch for vehicles using R134A refrigerant and a 12-volt electrical system, helping address failed pressure-sensor signals caused by corroded terminals or a damaged connector.

• Direct replacement HVAC pressure switch for A/C pressure monitoring
• Specific fit design for confirmed vehicle applications
• R134A refrigerant type
• 12V electrical rating
• Green oval connector with 2 terminals
• Pin terminal design, female connector / male terminals
• Screw-on mount with 3/8-16 thread diameter
• Maximum pressure reading: 600 PSI
• Pressure limits: closed at 290, open at 475

Fitment and Application Details

Compatible with select Chevrolet, GMC, and Cadillac trucks and SUVs, including 1994-2002 Chevrolet C1500, 1995-2002 Chevrolet Tahoe, 1994-2002 GMC Yukon, and 1999-2002 Cadillac Escalade applications. This Dorman 904-627 HVAC pressure switch also fits 1994-1999 Chevrolet K1500 and GMC K1500 models, making it a practical replacement for common GM A/C pressure sensor failures.

This part cross-references Four Seasons 36655 for the same application.

What It Helps Fix

• Air conditioning that stops cycling or stops responding to pressure changes
• Corroded terminals at the original A/C pressure sensor
• Broken or damaged connector on the factory switch
• Incorrect pressure signal to the HVAC control system
• Loss of A/C operation on GM truck and SUV platforms

Installation Notes

Verify the connector shape, terminal count, thread size, and refrigerant type before installation. This switch uses a screw-on mount and a specific-fit design, so matching the original sensor configuration is important for proper operation. Confirm the vehicle uses R134A refrigerant and the correct pressure thresholds before replacing the original unit.

Quality Assurance

Dorman designs this replacement A/C transducer switch to restore function when the original pressure switch has failed due to connector or terminal damage. Part number 904-627 is built for direct replacement use in confirmed applications.