Four Seasons 20630 HVAC Blower Motor Resistor - Rear

Four Seasons 20630 Resistor Block Overview

Four Seasons 20630 is a resistor block for HVAC blower motor speed control in rear climate systems. It uses a female rectangular connector and a 4-terminal layout to manage variable blower speeds in supported applications.

The Four Seasons Resistor Block line focuses on direct-fit HVAC electrical components for blower motor circuits. This part number, 20630, is built for rear-position applications where the blower speed circuit needs a replacement resistor block rather than a full motor assembly.

Key Features

• HVAC blower motor resistor block for rear blower speed control
• Female rectangular connector for a direct electrical interface
• 4-terminal design
• Variable speed operation
• Switches-type component for HVAC blower circuit control
• Cross-reference part numbers include 4P1602 and 1572813 for the same application

Fitment Details

• Fits 2003-2008 Isuzu Ascender, rear
• Fits 2002-2006 Chevrolet Trailblazer, rear
• Fits 2002-2006 Chevrolet Trailblazer EXT, rear
• Fits 2002-2006 GMC Envoy, rear
• Fits 2002-2006 GMC Envoy XL, rear
• Fits 2004-2005 GMC Envoy XUV, rear

What It Helps Fix

• Rear blower fan stuck on one speed
• Loss of lower or intermediate blower speeds
• Intermittent rear HVAC fan operation
• Electrical resistance issues in the blower motor circuit
• Faulty rear climate control speed switching

Installation Notes

Verify the connector shape, terminal count, and rear-position fitment before installation. Match the original resistor block configuration to the vehicle’s HVAC wiring and inspect the blower motor circuit for heat damage or corrosion that could affect the new part.

Quality Assurance

Four Seasons supplies HVAC replacement components for service applications, and this resistor block is identified by part number 20630 for accurate ordering and fitment matching.