Question about 2003 Mitsubishi Galant

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No Electrical Power to Heater Blower

I pulled the blower and bench tested it. Works fine. I removed the blower switch and checked for power at the plug. No power. Fuse is good. Battery is good. Green LED at blower switch does not come on. Any ideas?

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  • Benbill May 15, 2009

    Thanks for these hints. I will try to find these items. I don't know where the resistor is. I'm not sure which relay is for the blower, but I did swap them since they were all the same. I have tried to measure voltage at the plug by running a separate ground wire to the battery and checking for 12V at the plug that goes to the blower switch, with the ignition on. I get nothing. I think the blue wire is the 12V lead, but I checked all five wires at the plug.

  • Benbill May 20, 2009

    I replaced the resistor and still don't get 12V to the switch nor does the blower run. Might there be another fuse, say inline somewhere?

  • Benbill May 21, 2009

    I had suspected the ground wire, too, so I ran a separate ground jumper to the battery. Still nothing. Thanks for your comment. Do you know of anything else?

  • Benbill May 22, 2009

    Found the problem. There is a 2nd fuse box inside the car on the end of the driver side dash board. The blower has (2) 30a fuses in this fuse box. One of them was blown. The resistor was also cracked and the fusible link separated. Must have been some overload. However, all works fine for now.

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  • Master
  • 957 Answers

First thing to check would be the fan speed resister, fan(blower-motor)relays, and possibly a bad ground. Start at switch on the dash and go to the relays and resister next.

Posted on May 15, 2009

  • larry blais
    larry blais May 21, 2009

    I don't have the schematic to tell you witch pin or wire is faulty but I would be almost positive that your problem lies within a ground wire to your fan speed switch. Your blower works, your getting power to the resister and the switch but your fan isn't coming on. Sound like a broken ground wire or connection.

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