Cooling Fans Don't Stop Running After The Ignition Is Off? - Taurus Car Club of America : Ford Taurus Forum
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post #1 of 20 (permalink) Old 05-29-2008, 11:10 AM Thread Starter
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I noticed my cooling fans didn't stop running after I shut off the car yesterday. It was the first time this has happened. I just went on a trip that was 2 hours each way and when I got back this happened. The ignition was off and the engine wasn't running but the cooling fans kept running. And even when I pulled the fuse they kept running. I had to disconnect the battery to get them to stop. I waited for a while to let the engine cool (even though it wasn't saying it was abnormally hot or anything) and reconnected the battery and the fans still came on. Any idea what could be causing this?
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post #2 of 20 (permalink) Old 05-29-2008, 11:22 AM
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They're electric cooling fans, so they can still run after the ignition is turned off to further cool the engine bay, but they shouldn't keep running after the engine bay is cooled. It sounds like you've got a bad relay or temp sensor.

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post #3 of 20 (permalink) Old 05-29-2008, 12:36 PM
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They should NOT run with the ignition off. There is a wiring problem between the PCM and the CCRM or the relay in the CCRM is sticking on. I would give the CCRM a whack when it's doing this. If it stops then the relay was sticking on and the CCRM needs replaced.

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post #4 of 20 (permalink) Old 05-29-2008, 01:46 PM Thread Starter
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They should NOT run with the ignition off. There is a wiring problem between the PCM and the CCRM or the relay in the CCRM is sticking on. I would give the CCRM a whack when it's doing this. If it stops then the relay was sticking on and the CCRM needs replaced.
[/b]
Can you tell me what the pcm and ccrm is and where the location is, please? Thanks.
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post #5 of 20 (permalink) Old 05-29-2008, 02:29 PM
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Can you tell me what the pcm and ccrm is and where the location is, please? Thanks.[/b]

PCM is the main computer (DON'T WHACK IT!!!!), and is usually located behind the glove box, you'll see the VERY large bundle of wires coming through the firewall on the passenger's side.

CCRM is the Constant Control Relay Module, it is a little black box with a bunch of numbers and one single "big" letter on it. I'm not exactly sure where it is on a genIII, best guess is driver's side up near the radiator. It houses several relays, A/C clutch, ignition, EEC(computer), fuel pump, cooling fans, and maybe one or two more. As Paul stated, you could have a problem with the cooling fan relay portion sticking. Unfortunately unless you want to completely disassemble the thing and are great at electrical repair and soldering, they are non-serviceable and need replacement when they start acting up.

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post #6 of 20 (permalink) Old 05-29-2008, 02:31 PM
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PCM is in the firewall on the passenger side. Look for a large wire loom and plug. But if that is usually not the problem.

The CCRM is located on the fender side of the battery.

If the PCM is disconnected and the key is turned on the high speed fans will run. This is because the PCM is commanding the fans off unless logic says turn them on. FWIW.

Paul Nimz
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post #7 of 20 (permalink) Old 05-29-2008, 02:38 PM Thread Starter
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OK, I'll check into it. Thanks guys.
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post #8 of 20 (permalink) Old 05-29-2008, 05:08 PM Thread Starter
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I think I might have over reacted. The fans were running for a while after the car was off so i just kind of jumped the gun. It was a long trip and the air condition compressor was running and I think the engine compartment may have been pretty warm and the fans were just on to cool it. I know some cars have fans that still run after the ignition is off to cool the radiator down to a certain temp.

But, anyway, I went out today and hooked up the battery and the fans didn't come on. I started the car, let it reach temp and drove it a bit with the air on and when I came back home and the cooling fans came on like normal and when I shut it off the fans shut off with it.

I suppose it was just normal and maybe I panicked a bit but it seems fine now. Thanks for all the advice.
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post #9 of 20 (permalink) Old 05-29-2008, 05:47 PM
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As far as I know, on all Fords I've driven the fan turns off with the ignition.


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post #10 of 20 (permalink) Old 05-29-2008, 10:44 PM
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The relay may be starting to fail. It may work sometimes, and stick sometimes.

I'd keep an eye on it. I suppose it could kill your battery.

95 Taurus GL less than 60K miles
97 Z24 less than 50K miles
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