973-407 Front HVAC Fan Blower Motor Resistor

Key Features

• Direct-fit replacement for the original equipment blower motor resistor.
• Restores the function of variable fan speeds for your vehicle's front HVAC system.
• Kit includes a new resistor and a wiring harness pigtail to repair melted or corroded connectors.
• Engineered to match the performance and fit of the original component.
• Package contains: 1 resistor, 1 wiring harness, and butt connectors for splicing.

Replaces / Cross-Reference Part Numbers

• Dorman: 973-407
• OE: 89018778
• OE: 89019351
• OE: 1581638
• OE: 93803636

Compatibility & Fitment

• Fits select Chevrolet and GMC truck and van models.
• Chevrolet Express 1500, 2500, 3500
• Chevrolet C4500, C5500, C6500, C7500 Kodiak
• GMC Savana 1500, 2500, 3500
• GMC C4500, C5500, C6500, C7500 Topkick

When to Replace

• HVAC fan only operates on the highest speed setting.
• Fan speed is uncontrollable or stuck on one speed.
• No air blows from the vents at any fan speed.
• Visible burn marks, corrosion, or melting on the original resistor or its electrical connector.

Installation Tips

• Disconnect the vehicle's battery before beginning installation.
• The resistor is typically located in the HVAC ductwork behind the glove box or on the passenger side of the lower dashboard.
• Inspect the original wiring connector for heat damage or corrosion; use the included pigtail harness for repair if needed.
• Ensure a secure connection when splicing the new harness to prevent overheating and future failure.