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Discussion Starter #1
this in an ongoing problem for me. my fans will not work without the a/c on. the resistor and wiring was replaced a few months ago. no change. fans still only work when a/c is on. is there an accurate way to test this resistor? thanks.
 

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Can you monitor your engine temp using the electronic odometer test mode? The directions are detailed in the How-To archive in the dark blue banner just below the title of this thread. Engine temp will be displayed as [89 C], and will be displayed in Celsius.
 

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Discussion Starter #3
I have done that. I get a steady climb to 110 C and still no fans. I then turn on the a/c and it slowly cools down. I don't like getting my hoses this hot very often. Because of obvious reasons. I am wondering if there is a way to remove and test the resistor. thanks.
 

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You can test a resistor that is part of electronic system using a multimeter, I'm sure it would apply in this situation too if you can find the specs. Honestly so many of these have been documented to fail that probably its easier to buy a new one. It takes 1 minute and no tools to remove the old resistor and put in a new one. If the wiring harness is burnt out that could be it too. In my case with my 02 I had to replace both parts.
 

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Discussion Starter #5
I have done that. Several times. I'm simply tired of spending money on parts if the old one is still good. Apparently there is no way to test these?
 

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DTC P0606
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With a multimeter, Ford specs say you should see a resistance of 0.25 ohms between pin 1 and 2 of the resistor. I assume if your fans don't work and the resistor alone was faulty, you'd see an open or infinite resistance.
But as DeeZX5 points out a bad resistor usually takes the wiring connector and some wiring with it.
 

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Hatch Nation #136
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You could try and use the fan always on trick, also from the How-To section. That way you can eliminate the relay as the issue.

You should also check the wiring around the resistor, as this is also a known point of failure. You may just have a sketchy wire.
 

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'Bro' is 4 years old..................
 

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This thread from 2011 only addresses checking the low speed fan resistor, one possible reason for no low speed operation only.

Worth checking but just one common cause for that particular problem.

Posting your exact issue in it's own thread will get the most responses, and searching this section for more detailed cooling fan information might be useful.
 
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