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Old 05-31-2011, 08:11 PM   #1
NH-Focus
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2.3L Duratec (PZEV) Radiator Fan Probs

I know there are a ton of threads related to fan problems, but I can't find any that speak to the Duratec 2.3 engine. It is a completely different animal.
The bottom line is my fan doesn't come on. Any help on where to start? Pictures would be very helpful.


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Old 06-02-2011, 01:29 PM   #2
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it has a different motor but fan problems are universally the same. You could have a bad resistor on the fan, or a bad coolant temperature sensor.

Does the Fan come on when you turn your A/C on? If it doesn't then the issue is that the fan is not getting any power at all, start by checking fuses and your wiring to the fan.
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Old 06-02-2011, 09:38 PM   #3
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I don't have AC. I replaced the Thermostat, and switched out the Fan Relay, and that didn't help. The Connectors look OK. My problem is that I can't locate the resistor. It doesn't seem to be where others say it is.
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Old 06-07-2011, 04:04 PM   #4
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any help?
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Old 06-07-2011, 05:53 PM   #5
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Assuming you mean the engine cooling fan. If you mean the cabin air fan, then you should let us know. I assume you mean the engine cooling fan because the cabin air fan doesn't have a relay.

On the PZEV, the engine cooling fan should have 2 relays- look in your owner's manual. You should have a low speed and a high speed relay. There is only one fuse though, but it's a 50a if memory serves correctly. It's located in the under hood fuse box. To find the exact location, look in your owner's manual. Your fuse location might be different than mine since I have an 05.

Now, on to cooling fan diagnostics if the fuse checks out, and the relays are good. Unplug the fan, find each relay, make a jumper with spade terminal connectors. Look at the diagram on the side of the relay, and jump the 2 normally open power contacts. The smaller pins are what operate the relay- the large pins are the power. The numbers that correspond to the pins are printed on the bottom of the relay. You can also look in the socket, and you'll see that there aren't terminals installed on the NC side of the relay. Now use a digital multi-meter to read voltage at the fan plug. Double check your jumper to make sure power is going through it, and also double check to be sure that the other fan is not the fan you're supplying power to. If you find that you have 10v, then see if the relay you jumped is high speed or low speed. Low speed relays will not show 12v. That tests both the relay and the resistor.

From my experiences, the fan motors go out on Dtecs. The problem with the Zetec engines was that the exhaust was very close to the fan resistor. That caused the resistor to go bad as well as damaged the fan plug-in. That's not to say that a Dtec resistor is always going to be good. If you can't get voltage to the fans, but you have 12v to ground on both sides of the relay- then it's time to find the resistor pack.

You can also use the electronic odometer to check your coolant temp in C while driving. Check our How-To files, and instead of counting presses, just look for the display to read [ 25 C] or whatever is appropriate for your ambient temp at the time. Both fans should be on full speed at like 100C.
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Old 06-08-2011, 04:26 PM   #6
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Thank you, I will try it out and let you know.
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Old 03-22-2014, 03:41 PM   #7
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Thank you, I will try it out and let you know.
What happened?
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Old 03-23-2014, 12:29 AM   #8
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d.e. - not much point asking what happened when the thread is from almost three years ago and the OP hasn't posted since.

Whynot's advice in the thread is very useful, but the solution in that case will likely never be known.
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Old 04-03-2014, 11:11 PM   #9
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Agreed!

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d.e. - not much point asking what happened when the thread is from almost three years ago and the OP hasn't posted since.

Whynot's advice in the thread is very useful, but the solution in that case will likely never be known.
Agreed!
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Old 07-22-2014, 10:07 PM   #10
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Which sucks because my 2005 2.3L Focus ST just started overheating this morning. It was raining and I was using the fan on high with the defroster set to front window. while sitting in a parking lot waiting to pick up a friend my car totally started filling with warm wet fog on all the windows and the temp gauge went full red! Once I started moving the gauge dropped back down and the fog cleared. cut to later in the day and i left the car sitting at idle and it started to overheat again, this time I was watching the fans. They never clicked on even with the temp pegged. We jumped the high speed relay and the fan turned on and kept the car at normal temps. hoping it's just a bad relay. but i guess i need to test the coolant temp sensor as well.
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