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Old 02-06-2010, 08:13 PM   #1
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Default heater fan switch trouble?

one speed on the fan switch (not low but the 1st speed after) is not working on my 2002 fx4 4.6. Has anybody had this trouble and how to fix it? Do u think it is in the switch? Any help would be great!
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Old 02-06-2010, 09:12 PM   #2
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Blower speed controller has probably gone bad.

Click the image to open in full size.
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Old 02-06-2010, 09:15 PM   #3
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Smile

Probably not the selector switch. On my 97 it was the blower motor resistor
board. It was around $20.00 from the dealer. It's next to the glove box on the left side. It has two screws holding it in and a wire with a plug going to it. You will be able to change it in under 10 minutes or so. Good Luck
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Old 02-06-2010, 09:21 PM   #4
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I agree with the Blower Motor Resistor. easy to replace. dealer or local parts store. low speed not working, the second is next, third next until all you have left is high only.
My guess is the condensation inside corrodes the wires and they break.

Last edited by sharptp; 02-06-2010 at 09:30 PM.
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Old 02-06-2010, 10:32 PM   #5
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Ok we got 2 answers here. If you have manual heat and A/C the Blower Motor Resistor is the answer and if you have the automatic temp control the Blower Speed Controller is the answer.
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Old 02-07-2010, 09:50 AM   #6
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Thanks guys,I will try the BMR
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Old 02-17-2010, 05:00 PM   #7
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Thumbs up Fixed my blower motor speeds

Just replaced this Blower Motor Resister, its fixed (real easy) all speeds now work
Cost 16 dollars with my discount at NAPA.
BIG THANKS to Sharptp and the rest of you for posting the fix



Quote:
Originally Posted by sharptp View Post
I agree with the Blower Motor Resistor. easy to replace. dealer or local parts store. low speed not working, the second is next, third next until all you have left is high only.
My guess is the condensation inside corrodes the wires and they break.
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Old 02-17-2010, 06:56 PM   #8
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I wonder - am I the only person that hasn't had the BMR go bad on their truck yet?
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Old 12-17-2010, 07:19 PM   #9
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Default Blower not working on high

Any body have any other ideas. I have a 2004 FX4, and the blower works on 1, 2, and 3. It works on 4 but runs the same speed as 3, so basically I have 1, 2, and 3, and 3 again. I changed the resistor (ford part) today, but it did not fix the problem.
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Old 12-18-2010, 12:57 AM   #10
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Quote:
Originally Posted by Al Mac View Post
Any body have any other ideas. I have a 2004 FX4, and the blower works on 1, 2, and 3. It works on 4 but runs the same speed as 3, so basically I have 1, 2, and 3, and 3 again. I changed the resistor (ford part) today, but it did not fix the problem.
Your Blower Motor Switch bypasses the Blower Motor Resistor when turned on High.

You can check the resistance on the Blower Motor Switch(dash), or do it the easy way, Take it out, go to Advance or another parts store that allows returns, and put in the new one, if it works you are good to go, if it doesn't fix the problem, return it, you are just out your time.

Then I would Check the wiring from every connection from the Dash Blower Motor Switch down to the Blower Motor itself for corrosion/melting. Cleaning them with a can of electrical cleaner along your inspection.
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Old 12-18-2010, 12:57 AM
 
 
 
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