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Old 09-20-2012, 04:14 PM   #1
Godzill138
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Cooling fan resistor issue

Hello,

I was wondering if someone had issues with their cooling fan resistor, I got to replaced the 3rd one today.

Any info will be apreciated, and hope I can help as well other memebers.


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Old 09-20-2012, 04:18 PM   #2
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absolutely. Many seem to have trouble with it.
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Old 09-20-2012, 04:20 PM   #3
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it will be nice to get to a definitive solution...
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Old 09-20-2012, 04:23 PM   #4
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have you tried searching the forum? I don't have any specific experience with the issue but I know there are plenty of threads on it.
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Old 09-21-2012, 02:08 AM   #5
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well I am checking... Hope I can get a solution, $70 every month is not a good deal
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Old 09-21-2012, 02:38 AM   #6
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well i believe repeat resistor failure can be attributed to either a high system amperage or excessive resistance in the circuit if that helps any.
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Old 09-21-2012, 02:54 AM   #7
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yes, correct, in this case it should be the fan, I guess the fan is either defective or has a bad design. I am working on installing a 40amps rele, so the resistor stops getting that much amps.
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Old 09-21-2012, 04:00 AM   #8
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Fan is causing drag, this will over load the system
Add a speaker breaker just below the amp rating of the fuse for the system to test it. it will break without killing the resistor but will kill the fan when tripped and when it cools it will work again.
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Old 10-05-2012, 12:17 AM   #9
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Thanks MIKE and VEGAS for the reply, I will like to share what happened to my AC fan.

After 1 year of several issues with my focus, 2 AC compressors burned (due to poor air cooling), 3 AC resistors, 3 fan connector pigtails... I decided to stop the car and tear down the fans cables, resistors and motors to resolve this issue.

If you are a focus owner 2000-2007 you will find this very useful.

Looking the Mitchel diagram, I was able to understand the fans functionality, AC fan will start in low speed when AC is ON and according to radiator temp using the AC resistor will increase to a faster speed if needed working with the radiator fan.

After a few tests I decided to check cables, fuse box, AC resistor and everything looked fine, so the only thing missing was to check the fans motor consumption, and done. According to Mitchel both fans to max speed will not load more than 50 AMPS to my car and guess what, the AC fan only at max speed was taking 52 AMPS... so I purchase a new AC fan motor and checked again the consumption, at max speed 18 AMPS.

So if you are having issues with more than 1 AC resistor for a year, check you fans.
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