Dorman 645-403 HVAC Blower Motor Resistor Connector - Front or Rear
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Dorman

Dorman 645-403 HVAC Blower Motor Resistor Connector - Front or Rear

Brand Dorman 645-403
Position Rear
Overall Length (In) 11.81 in
Package Contents 1 Harness - 4 Butt Connectors
Terminal Gender Female
Terminal Material Phosphor Bronze (Tin Plate)
Terminal Type Blade
Wire Gauge Measurement 20
Wire Quantity 4
Fits Ford and Mercury · 139 vehicles

OE direct replacement. Replaces a damaged original connector with a precise fit.

Corrosion-resistant terminals. Phosphor bronze with tin plating helps maintain reliable performance.

Blade terminals. Female connectors provide a secure electrical connection.

Cross-references NGK 1068, 1P1700 and 3U2Z14S411ZEA for the same application. See all 3.

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Dorman 645-403 HVAC Connector Overview

Dorman 645-403 is an HVAC blower motor resistor connector built to replace an original connector damaged by corrosion or heat. It uses 4 female blade terminals with phosphor bronze, tin-plated contacts for dependable electrical connection in blower motor resistor circuits.

Compatible With Ford F-150, Ford Explorer, Ford Expedition, Lincoln Navigator, and other 4-way HVAC applications across 2004-2017 model years.

Key Features

  • 4-wire HVAC blower motor resistor connector for 4-way systems
  • Female blade terminal design for secure mating
  • Phosphor bronze terminals with tin plating for corrosion resistance
  • 20-gauge wire specification
  • 11.81-inch overall length for harness routing
  • Direct replacement style for damaged OE connector repair

Detailed Description

This Dorman HVAC blower motor resistor connector is designed for vehicles where the original plug has overheated, corroded, or lost reliable contact. The connector uses female blade terminals and a 4-wire layout to restore the electrical path between the blower motor resistor and the HVAC harness. Dorman 645-403 is a practical repair solution for Ford and Lincoln trucks, SUVs, and cars that use a 4-way blower motor resistor connector, including Ford F-150, Ford Explorer, Ford Expedition, and Lincoln Navigator applications.

This part cross-references OE-style numbers such as 1P1700 and 3U2Z14S411ZEA for the same application.

What It Helps Fix

  • Blower motor operation that stops working because of a damaged connector
  • Intermittent HVAC fan speeds caused by poor terminal contact
  • Heat-related melting or discoloration at the resistor plug
  • Corrosion at the connector terminals
  • Electrical resistance issues in the blower motor resistor circuit

Installation Notes and Tips

Inspect the resistor, terminals, and surrounding harness before installation. If the original connector shows heat damage, replace any affected wiring sections and verify terminal fit before reconnecting the HVAC circuit. Confirm the vehicle uses a 4-way blower motor resistor connector and match the connector style to the original plug before final assembly.

Quality Assurance

Dorman replacement electrical connectors are built for repair work where the original connector has failed from corrosion or overheating. The phosphor bronze, tin-plated terminal material supports consistent contact performance in HVAC electrical service.

This part fits 139 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelSubmodelPositionNotes
2017FordExpedition—Front4 Way
2017LincolnNavigator—Front4 Way
2016FordExpedition—Front4 Way
2016FordExplorer—N/A4 Way
2016LincolnNavigator—Front4 Way
2015FordExpedition—Front4 Way
2015FordExplorer—N/A4 Way
2015LincolnMKS—N/A4 Way
2015LincolnNavigator—Front4 Way
2014FordExpedition—Front4 Way
2014FordExplorer—N/A4 Way
2014FordF-150—N/A4 Way
2014FordMustang—N/A4 Way
2014LincolnMark LT—N/A4 Way
2014LincolnMKS—N/A4 Way
2014LincolnNavigator—Front4 Way
2013FordExpedition—Front4 Way
2013FordExplorer—N/A4 Way
2013FordF-150—N/A4 Way
2013FordFiesta—N/A4 Way
2013FordFlex—N/A4 Way
2013FordMustang—N/A4 Way
2013FordTaurus—N/A4 Way
2013LincolnMark LT—N/A4 Way
2013LincolnMKS—N/A4 Way
2013LincolnMKT—N/A4 Way
2013LincolnNavigator—Front4 Way
2012FordEscape—Front4 Way
2012FordExpedition—Front4 Way
2012FordExplorer—N/A4 Way
2012FordF-150—N/A4 Way
2012FordFiesta—N/A4 Way
2012FordFlex—N/A4 Way
2012FordMustang—N/A4 Way
2012FordTaurus—N/A4 Way
2012LincolnMark LT—N/A4 Way
2012LincolnMKS—N/A4 Way
2012LincolnMKT—N/A4 Way
2012LincolnNavigator—Front4 Way
2011FordEscape—Front4 Way
2011FordExpedition—RearHVAC Blower Motor Resistor Connector - 4 Way
2011FordExplorer—N/A4 Way
2011FordF-150—N/A4 Way
2011FordFiesta—N/AHVAC Blower Motor Resistor Connector - 4 Way
2011FordFlex—Front4 Way
2011FordMustang—N/A4 Way
2011FordTaurus—N/A4 Way
2011LincolnMark LT—N/A4 Way
2011LincolnMKS—N/A4 Way
2011LincolnMKT—Front4 Way
2011LincolnNavigator—Front4 Way
2011MercuryMariner—Front4 Way
2010FordCrown Victoria—N/A4 Way
2010FordEscape—Front4 Way
2010FordExpedition—RearHVAC Blower Motor Resistor Connector - 4 Way
2010FordExplorer—Rear4 Way
2010FordExplorer Sport Trac—N/A4 Way
2010FordF-150—N/A4 Way
2010FordFlex—Front4 Way
2010FordMustang—N/A4 Way
2010FordTaurus—N/A4 Way
2010LincolnMark LT—N/A4 Way
2010LincolnMKS—N/A4 Way
2010LincolnMKT—Front4 Way
2010LincolnNavigator—Front4 Way
2010MercuryGrand Marquis—N/A4 Way
2010MercuryMariner—Front4 Way
2010MercuryMountaineer—Rear4 Way
2009FordCrown Victoria—N/A4 Way
2009FordEscape—Front4 Way
2009FordExpedition—RearHVAC Blower Motor Resistor Connector - 4 Way
2009FordExplorer—Rear4 Way
2009FordExplorer Sport Trac—N/A4 Way
2009FordF-150—N/A4 Way
2009FordFlex—Front4 Way
2009FordMustang—N/AHVAC Blower Motor Resistor Connector - 4 Way
2009FordTaurus—N/A4 Way
2009FordTaurus X—N/A4 Way
2009LincolnMKS—N/A4 Way
2009LincolnNavigator—Front4 Way
2009MercuryGrand Marquis—N/A4 Way
2009MercuryMariner—Front4 Way
2009MercuryMountaineer—Rear4 Way
2009MercurySable—N/A4 Way
2008FordCrown Victoria—N/A4 Way
2008FordEscape—Front4 Way
2008FordExpedition—RearHVAC Blower Motor Resistor Connector - 4 Way
2008FordExplorer—Rear4 Way
2008FordExplorer Sport Trac—N/A4 Way
2008FordF-150—N/A4 Way
2008FordMustang—N/AHVAC Blower Motor Resistor Connector - 4 Way
2008FordTaurus—N/A4 Way
2008FordTaurus X—N/A4 Way
2008LincolnMark LT—N/A4 Way
2008LincolnNavigator—Front4 Way
2008MercuryGrand Marquis—N/A4 Way
2008MercuryMariner—Front4 Way
2008MercuryMountaineer—Rear4 Way
2008MercurySable—N/A4 Way
2007FordCrown Victoria—N/A4 Way
2007FordExpedition—Front4 Way; Manual Temperature Control
2007FordExpedition—RearHVAC Blower Motor Resistor Connector - 4 Way
2007FordExplorer—Rear4 Way
2007FordF-150—N/A4 Way
2007FordFive Hundred—N/A4 Way; Manual Temperature Control
2007FordFreestar—N/A4 Way; Manual Temperature Control
2007FordFreestyle—N/A4 Way; Manual Temperature Control
2007FordMustang—N/AHVAC Blower Motor Resistor Connector - 4 Way
2007LincolnMark LT—N/A4 Way
2007LincolnNavigator—Front4 Way
2007MercuryGrand Marquis—N/A4 Way
2007MercuryMontego—N/A4 Way; Manual Temperature Control
2007MercuryMountaineer—Rear4 Way
2006FordCrown Victoria—N/A4 Way
2006FordF-150—N/A4 Way
2006FordFive Hundred—N/A4 Way; Manual Temperature Control
2006FordFreestar—N/A4 Way; Manual Temperature Control
2006FordFreestyle—N/A4 Way; Manual Temperature Control
2006FordMustang—N/AHVAC Blower Motor Resistor Connector - 4 Way
2006LincolnMark LT—N/A4 Way
2006MercuryGrand Marquis—N/A4 Way
2006MercuryMontego—N/A4 Way; Manual Temperature Control
2005FordCrown Victoria—N/AFrom 12/06/04
2005FordF-150—N/AHVAC Blower Motor Resistor Connector - 4 Way
2005FordFive Hundred—N/A4 Way; Manual Temperature Control
2005FordFreestar—N/A4 Way; Manual Temperature Control
2005FordFreestar—N/Aw/Rear Auxiliary A/C
2005FordFreestyle—N/A4 Way; Manual Temperature Control
2005FordFreestyle—N/Aw/Rear Auxiliary A/C
2005FordMustang—N/AHVAC Blower Motor Resistor Connector - 4 Way
2005MercuryGrand Marquis—N/AFrom 12/06/04
2005MercuryMontego—N/A4 Way; Manual Temperature Control
2004FordF-150FX4N/AHVAC Blower Motor Resistor Connector - 4 Way
2004FordF-150STXN/AHVAC Blower Motor Resistor Connector - 4 Way
2004FordF-150XLN/AHVAC Blower Motor Resistor Connector - 4 Way
2004FordF-150XLTN/AHVAC Blower Motor Resistor Connector - 4 Way
2004FordF-150LariatN/AHVAC Blower Motor Resistor Connector - 4 Way
2004FordFreestar—N/A4 Way; Manual Temperature Control
2004FordFreestar—N/Aw/Rear Auxiliary A/C
Directly replaces or cross-references 3 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
NGK — 10681P17003U2Z14S411ZEA