July 21, 2026

When lower fan speeds die and only high works, the blower resistor has failed. Here’s why high still works, how to check the melted connector everyone misses, and the amp-draw test that stops the resistor from failing again.

If your 2003–2006 GM truck’s speedometer is pegged at 120 or the fuel gauge is lying, the cluster’s stepper motors have failed. Here’s how to confirm it and the three ways to fix it, from a $30 solder job to a full cluster.