Blower Motor System Wiring Diagram (2002-2005 4.2L Chevrolet TrailBlazer)

With Automatic AC-Heater System

APPLIES TO: This blower motor circuit wiring diagram applies to the following vehicles:

• 4.2L Chevrolet TrailBlazer: 2002, 2003, 2004.
• 4.2L GMC Envoy: 2002, 2003, 2004.

With Manual AC-Heater System

APPLIES TO: This blower motor circuit wiring diagram applies to the following vehicles:

• 4.2L Chevrolet TrailBlazer: 2002, 2003, 2004.
• 4.2L GMC Envoy: 2002, 2003, 2004.

More 4.2L Chevrolet TrailBlazer (GMC Envoy) Test Tutorials

If this tutorial was helpful, be sure and take a look at all of the 4.2L Chevrolet TrailBlazer and GMC Envoy test tutorials in this index:

• GM 4.2L Index Of Articles.

Here's a sample of the tutorials you'll find there:

• How To Test For A Blown Head Gasket (2002-2009 4.2L Chevrolet TrailBlazer).
• How Often Should I Replace The Spark Plugs? (2002-2009 4.2L Chevrolet TrailBlazer).
• How To Test Engine Compression (2002-2009 4.2L Chevrolet TrailBlazer).
• Electronic Throttle Body Tests (2002-2007 4.2L Chevrolet TrailBlazer).