Dorman 645-740 HVAC Switch Connector

Dorman 645-740 HVAC Switch Connector

Dorman 645-740 is a female HVAC switch connector built to match the original connector’s appearance and function on specified Ford, Lincoln, and Mercury applications. It uses quality materials for dependable electrical connection and long-term durability in repair and replacement work.

• Female, round connector design
• 4-terminal layout with female blade terminals
• 16-gauge wire construction for repair use
• Includes pigtail and butt connectors for splice repair
• Direct replacement style for selected HVAC and idle air control valve connector applications

OE-Style Replacement Details

This HVAC switch connector is engineered for service work where the original connector housing or terminals are damaged, heat-affected, or no longer making a secure connection. Dorman 645-740 is a practical replacement for vehicles such as the Ford F-150, Ford Explorer, and Ford Mustang, with fitment coverage across multiple Ford, Lincoln, and Mercury models from 1990 through 2017. This part cross-references Standard Ignition S-805 for the same application.

Common Problems It Can Help Address

• Broken or brittle connector housings
• Loose or intermittent electrical contact at the HVAC switch connector
• Corroded or heat-damaged terminals
• Wiring repairs after connector failure
• Restoring a secure connection on idle air control valve-related wiring

Installation Notes and Tips

Verify terminal count, connector shape, and wire gauge before installation. Match the existing wiring layout carefully when splicing the pigtail into the harness, and inspect the mating component for corrosion or terminal damage before reconnecting. Confirm vehicle-specific fitment for the exact year, make, and model, including Ford E-350 Super Duty, Ford Transit Connect, and Lincoln Navigator applications listed in the fitment data.

Quality Assurance

Dorman designs this connector to match original hardware on specified applications and manufactures it from quality materials for reliable performance and durability.