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Heating & Air Conditioning Does your heater blow cold air? Does your air conditioning blow hot air? Post your all of your technical issues related to your heating, heating core, air conditioning unit and controls here. Don't wait until it is to late to get these important vehicle functions fixed.

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Old 05-31-2008, 10:59 AM   #1 (permalink)
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Default No Blower - But Motor Works Direct?

My 2005 Ford Focus heating/air blower doesn't work at all. The fuse is ok. I took out the blower, and put a ground and hot wire to the blower motor and it works.
I checked the wiring coming to the motor and one wire is hot, as long as the ignition is on, no matter what position the blower motor switch is on.
Even though that wire is hot, when I put the connector back on the blower motor, nothing happens.....even though my tester says their is juice coming to the connector, and when I hot wire the motor directly it runs. The connector seems to go right on to the leads to the motor, nothing in between...but it doesn't run. HOW CAN THIS BE??
The manual said something about a resistor.....but I can find nothing. It's only two fat wires to a connector...that plugs into two leads that carry the juice to the motor. Again, when I hot wire it....it works, When I plug in the connector that shows there is electric, there is nothing. HELP PLEASE!!
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Old 05-31-2008, 11:57 AM   #2 (permalink)
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It is ground side controlled,I would guess the resistor is bad.

Think of it as you have a wire hooked to the postive post of the batery to a light bulb and the other wire just hanging there.there is 12 volts all the way through but the bulb wont light til you ground it to the negative side of the battery.

+-------Bulb-------12volts here but wont lightup until it touches here -negative post
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Old 05-31-2008, 01:09 PM   #3 (permalink)
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Default ok, now if I can find that darn resistor

ok, now if I can find that darn resistor. It says "the motor control resistor can be removed by removing the screw at one end of the resistor, then pulling the resistor our of the heater housing" I don't were it is....
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Old 05-31-2008, 04:57 PM   #4 (permalink)
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behind the glovebox I believe
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