Dorman Blower Motor Resistor Kit with Harness — Compatible Ford/Lincoln/Mercury, Requires Recall Completion & Scan Tool

The Dorman 973-399 blower motor resistor kit is a direct-fit replacement resistor and harness pigtail for select Ford, Lincoln and Mercury vehicles that restores HVAC blower speed control after recall repairs are completed.

This kit contains the resistor and harness needed for most repairs when the factory blower motor resistor has overheated or corroded. It’s engineered to match original equipment performance and is intended for a long-lasting repair when installed on compatible models. Note: affected vehicles require completion of the manufacturer’s OE blower motor recall and, in some cases, a scan tool programming step for the repair to function properly.

How will this kit solve a weak or non-functioning blower fan?

When a blower motor resistor fails, one or more fan speed settings may stop working or the blower may run only on high. This Dorman kit replaces both the resistor element and the harness pigtail, addressing common failure points caused by heat or corrosion. After installing the parts and completing any necessary OE recall work, the HVAC system’s speed selector should behave as designed.

• Includes resistor and wiring harness pigtail for a complete repair
• Replaces overheated or corroded OE resistor components
• Matches OE performance characteristics for fan speed control
• Requires prior completion of the OE blower motor recall for proper operation

Will this part fit my specific vehicle and what verification is required?

This kit fits many Ford, Lincoln and Mercury model years but fitment is vehicle-specific—always confirm using the seller’s garage tool before ordering. Look for the Confirmed Fit bar or the information icon for special notes; some applications require additional verification or programming with a scan tool. If you’re unsure, provide your vehicle trim and VIN in the fitment checker or consult a qualified technician.

• Compatible with select Ford Escape, Expedition, Explorer, F-Series and more
• Also fits Lincoln MKS/MKT/Navigator and certain Mercury models listed by year
• Use the garage tool and Confirmed Fit indicator for exact compatibility
• Scan tool programming may be required after installation on some models

Do I need to do anything before or after installing this resistor kit?

Yes—this replacement will only function correctly after the factory blower motor recall repairs have been completed on affected vehicles. In addition, certain vehicles require scanning and programming to reset HVAC modules or calibrate blower control. Follow the vehicle manufacturer’s recall instructions and, if needed, have a dealer or independent shop apply any required software updates.

• Complete the OE blower motor recall repairs first
• Check for any technical service bulletins related to HVAC control
• Be prepared to use or have access to a scan tool for programming where required
• Test all blower speeds after installation to confirm restored operation

What are the main benefits of choosing the Dorman kit over replacing only one component?

Replacing both the resistor and the harness pigtail addresses the most common failure points at once, reducing the chance of a repeat repair. Dorman designs these components to mirror OE performance, which helps ensure consistent blower speed control and improved reliability compared with patching a single damaged connector. The kit approach also shortens labor time by providing the typical parts needed for the repair in one packaged solution.

• Complete repair package reduces follow-up failures
• OE-matching performance for consistent fan speeds
• Fewer trips to the parts store—resistor and harness included
• Typical compatibility across many Ford, Lincoln and Mercury models

Who this is for: the Dorman 973-399 kit is aimed at vehicle owners, fleet managers and independent technicians dealing with blower speed loss or intermittent HVAC operation on the listed Ford, Lincoln and Mercury models. It’s especially useful when the original resistor shows signs of overheating or corrosion and when the vehicle has already had the required OE recall repairs completed. If you need confirmation of fitment or programming requirements, use the seller’s garage tool or consult a professional installer before purchase.