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Radiator Fan never spins
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Abdiel
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PostPosted: Tue Apr 18, 2017 2:52 pm    Post subject: Radiator Fan never spins Reply with quote

I have a 2002 that we bought used after a hard life. We're trying to help it finish strong and taking care of it to keep it running until it's replacement time. Hopefully one more year.

At any rate, I was having the issue where the fan runs after ignition is turned to OFF, which I now know is the first sign of a bad fan module. However, before my enlightenment, we observed that the A/C was not cooling at idle and once we started looking, noticed that the temperature of the engine was creeping up at idle too. We had the problem diagnosed as not only a bad module but also the engine coolant temperature sensor. They tested the fans and reported them to be fine.

Some research--including on here, of course--led me to believe that I could switch these parts out myself and save tons on labor, especially since I had changed out the ECT once already. Initially I purchased third party parts through Amazon. New parts did not fix the issue, however. My fans were not spinning.

Having read about all the bad third party modules, my next step was the dealer for an OEM part, but no dice. My fans still aren't spinning at all, and I'm at a loss. Does anyone have a new idea or suggestion for me? Is there a way that I can test the fan at home without paying for another round of diagnostics?

2002 MPV LX
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Pele
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Location: Woodbridge, Virginia, u.s.a

PostPosted: Tue Apr 18, 2017 9:00 pm    Post subject: Re: Radiator Fan never spins Reply with quote

Do you have a multi-meter and some test leads?

On the electronic control module that's bolted to the fans, there's three connectors...

There's two identical 2 pin ones. They go to the individual fan motors.
Unplug each fan. Use test leads or just some wire to connect the two pins to your battery + and - connections. If the fans are good, they'll spin. (If you get the connections backwards, the fans will spin backwards. They're still good.)

On the third connector, there's a fat white wire, a fat black wire, and a thin red wire... Fat white and Fat black should be +12 volts and Ground respectively with the key on.

The red is a signal from the ECU.

Regardless of the engine temp, the ECU should kick the fans on when the A/C is on. With everything hooked up, known good fan motors, and known good power to the fan control module, watch the A/C compressor. If the A/C compressor spins and the fans don't, guaranteed you have a bad module.

2003 ES - Coastal Blue Metallic - Side Airbags - Power Sliding Doors - Leather - Rear A/C (Original Options)

Self installed rear heat; heated mirrors, fog lights, large wiper bottle, Heavy duty wiper motor. Working on the whole 4-Seasons Package; Just need a transmission cooler.
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Abdiel
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PostPosted: Wed Apr 19, 2017 1:57 pm    Post subject: Re: Radiator Fan never spins Reply with quote

Tremendous mechanic spent hours for no pay giving me a further diagnosis: bad PCM. I'm not going to spend the money to replace it on a car with as many issues as this. Does anyone know a safe way to bypass the module and run the fans constantly while the car is on?
2002 MPV LX
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mpvinnig
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PostPosted: Sat Apr 22, 2017 1:55 am    Post subject: Re: Radiator Fan never spins Reply with quote

Abdiel wrote:
Tremendous mechanic spent hours for no pay giving me a further diagnosis: bad PCM. I'm not going to spend the money to replace it on a car with as many issues as this. Does anyone know a safe way to bypass the module and run the fans constantly while the car is on?


Get it used for less than $200 on ebay
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Abdiel
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PostPosted: Tue Apr 25, 2017 12:18 am    Post subject: Re: Radiator Fan never spins Reply with quote

Would that not mean an expensive trip to the dealer to reprogram it?

Basically this? http://www.ebay.com/itm/ENGINE-COMPUTER-PROGRAMMED-PLUG-PLAY-MAZDA-MPV-2002-AJ51-18881-C-MAB2-PCM-OEM-/352025201005?hash=item51f656496d:g:fTcAAOSw4CFY5~KS&vxp=mtr

2002 MPV LX
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PostPosted: Fri May 26, 2017 10:50 pm    Post subject: Re: Radiator Fan never spins Reply with quote

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PostPosted: Wed Jul 12, 2017 2:15 am    Post subject: Re: Radiator Fan never spins Reply with quote

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