A/C Blower Fan Issue

[Evil Trailblazer SS]

Originally Posted by TheApocalyptican

Specific voltages aren't necessary. The fact you have full voltage at all the wires say that the problem is either the switch or the wiring between the switch. If it were me,my next step would be to unplug the fan switch and use a heavy gauge wire to jumper the pins at the connector together one at a time to see if the blower then changes speeds.

Doing this I found that at the fan switch on the dash, the orange wire is the power supply and all three other wires are the speed outputs.

No matter which wire I jumpered the orange wire to, the fan blows at HI speed.
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