Question about 2006 Ford F-250 Super Duty

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A/c blower motor only operates on high.

All other a/c functions seem to operate correctly except fan control. fan control on the dash and the one on the steering wheel have no effect. blower runs on high no mater what you do.....

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  • pts4 Sep 07, 2009

    yes

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  • Master
  • 426 Answers

The blower motor resistor could be the cause, if not then its a problem directly relted to the ecm. There is not other components that control this circuit. I would check to verify there are all powers and grounds needed. if not I would bring it to the dealer or a reputable shop that can check the functionality with the scan tool and multimeters and such.
Hope this helps

Posted on Sep 07, 2009

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Posted on Jan 02, 2017

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Heater fan runs when heater is off.06 ford expoler


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Pinpoint Test Q: The Blower Motor Does Not Operate Correctly - EATC
Normal Operation Under normal operation, the blower motor control module receives a 1-2 volt signal from the EATC module through circuit CH218 (GN/VT) to determine the desired blower motor speed. The EATC module receives a feedback voltage from the blower motor control module through circuit VH219 (GY) to determine actual blower motor speed. When the highest blower motor setting is selected, the EATC module sends 12 volts to the blower control module through circuit CH217 (BN).
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Yes,could be your blower resistor is bad,it's right next to the blower motor,it controls the blower motor speed,easy to replace. Duralast Blower Motor Resistor Just took a guess at the model type since you didn't state,wow,high dollar price,guess it comes with a Mercedes,paid about 18 bucks for mine on my 85 Nissan.

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I'm going to start from the beginning.
The blower motor gets power from the high blower relay and it is grounded thru the fan switch and the resistor. So you should have power on the pink white blower wire coming from the high relay to the blower motor. The orange black wire from the motor is ground going to the resistor and fan switch. The blue wires on the control panel are for the ac compressor.
The high blower relay gets power from fuse number 5 in the box. The blower motor is grounded thru the resistor and then thru the fan switch.
Photo courtesy of AutoZone.com
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Try the Fan Speed on "high". If the Motor comes on only "high" and no other speed, then it is definitely the Blower (Fan) Motor Resistor and must be replaced. It is located behind the dash Glove Box. Remove the Glove Box. The resistor is located on the back fire wall, and has 3 to 4 wires going into it. It is approximately 3 1/2 inches wide by 1 1/2 inches high. Disconnect the electrical connection. There should be two bolts (I believe 8mm) holding the resistor in place. Remove the bolts and Remove and Replace. Check the operation.
If this does not solve it:
Pull the connection to the Blower Motor and check for Voltage with the Fan On "low". If correct voltage: the Blower Motor itself needs to be replaced.
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