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Old 03-02-2013, 05:19 PM   #1
kburt0
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Cooling Fan

I have been having a hard time diagnosing a problem with my 2002 ZX5s cooling fan. I had to replace it because the previous owners completely destroyed and so the fans did not function when I purchased the car. Today I installed a shiny new fan- new resistor, terminals, plugs- the works.

After test-driving the car I was dismayed to find that the car would still overheat at stops due to the fans not kicking on. I went through and tested both of the relays and they are both fine. I replaced the number six fuse, but that made no difference either. As far as I can tell, power is flowing precisely as it should, and yet the fans still will not turn on. I have also tried running the AC to see if that would get them to turn on- no luck.

At this point I'm kind of thinking that it has to be the Cylinder Head Temperature Censor. I don't really want it to be that because it looks like it's a pain in the butt to get to! I'm wondering if any of you have any ideas on any other things that could be causing the fans to misbehave. I'm also curious as to whether there are any tests I can perform to determine one way or another whether the sensor is defective or not. Thanks for the help!


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Old 03-02-2013, 07:42 PM   #2
don627
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Will the new fans turn if you apply 12 volts directly to them if so verify that the harness is supplying 12volts to the fan when they are supposed to. The A/C will start the fans regardless of the CHT if the A/C pressure is high enough.
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Old 03-02-2013, 08:14 PM   #3
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Try unplugging the fan connector in your driveway and connecting it to a voltmeter (look for 0v), then turn on A/C and check again; from your description, it should still read 0v.

Like the previous poster suggested, it's probably not your temp sensor -- unless it's accompanied by an A/C fault (which wouldn't be an unreasonable coincidence on an 11-year old car previously owned by an oaf). But if you wish to test it anyway, use the odometer test mode, which displays the temp in realtime Celsius on the dash LCD. Use the forum search box to find detailed instructions for that.
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Old 03-02-2013, 08:33 PM   #4
kburt0
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Thanks a lot for the suggestions. I'll try hooking up to the battery in the morning. Are you saying that if there were a problem with the AC, it could still indicate a sensor issue? I bought the car this winter and so haven't had much call for the air conditioning. The previous owners said that there might be something wrong with it, but at the time the blower motor relay pack needed replaced and I put even odds on that being the problem. If there was a problem, could that be related to my fan issues? Thanks again for the help.
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Old 03-02-2013, 08:53 PM   #5
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Quote:
Originally Posted by kburt0 View Post
Are you saying that if there were a problem with the AC, it could still indicate a sensor issue?
on a 11-year old Focus with a questionable repair history, nothing is out of the question
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Old 03-02-2013, 10:24 PM   #6
don627
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Well what we mean is if the a/c is faulty as well it will not turn on the fans so that test will not work in that case. I think I would verify like has been suggested that 12v is actually applied to the fans at the appropriate time. If it is the fans may be faulty.
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Old 03-04-2013, 02:52 AM   #7
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Run straight 12 volts to fans and see if they work. Then make sure the fan resistor is present and not burned up at the connector, they often do to kill low fans. That part is in top center of the fan shroud. Low fan power runs through the resistor, turning a/c on often tells if that circuit run is up and powered but if cold enough temperature outside then a/c will not turn on fans. One can bypass low fan relay with a simple jumper if they know how, to check the whole circuit, same with high fans...............
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