Dorman 604-5103CD HVAC Heater Water Shut-Off Valve Actuator

Dorman HVAC Heater Water Shut-Off Valve Actuator

Dorman 604-5103CD is an electrical HVAC heater water shut-off valve actuator built to match the appearance and function of the original part on specified applications. It is made with a plastic housing and is engineered for reliable operation in the heating and air conditioning system.

Compatible With select vehicle HVAC systems, this actuator is a direct-fit replacement for service work where the original heater water shut-off valve actuator has failed. The Dorman 604-5103CD is also referenced by part number 604-5103CD for ordering and cross-checking.

• Electrical activation for HVAC control operation
• Plastic construction for OE-style fit and function
• Matches the original actuator layout on specified applications
• Packaged as 1 air door actuator
• Cross-references Monroe Shocks & Struts (e.g., 577.55511, 3543H9635) for the same application

How This Actuator Works

This HVAC heater water shut-off valve actuator controls coolant flow through the heater circuit as directed by the vehicle’s climate control system. In applications such as Chevrolet Silverado and GMC Sierra HVAC repair, the Dorman 604-5103CD helps restore proper temperature control when the original actuator is worn, noisy, or no longer responding. It is built for direct replacement use in the HVAC heater water shut-off valve position.

Common Problems It Can Address

• No heat or inconsistent cabin temperature control
• Heater water valve not opening or closing correctly
• Clicking, binding, or failed actuator movement
• HVAC temperature changes that do not match control input
• Climate control performance issues tied to actuator failure

Installation Notes

Verify the original actuator part number, connector style, and mounting location before installation. This part is an electrical HVAC actuator, so the vehicle should be inspected for wiring, control head, and valve condition if the original failure was caused by a system fault. Confirm fitment for the exact year, make, and model before service; this part number 604-5103CD is used on specified applications only.

Quality Assurance

Dorman engineers this replacement actuator to follow the appearance and function of the original component on listed applications. The design focus is dependable HVAC operation and durability in normal service conditions.