Radiator fans will not shut off

Tiny
DONNA ROSENGRANT
  • MEMBER
  • 2005 FORD FIVE HUNDRED
  • 3.0L
  • 4WD
  • AUTOMATIC
  • 80,000 MILES
First fans would not shut off.
I was pulling my fuse when I stopped and shut off the car.
Then fans stopped running.
And the fuse is good.
Control module is my guess.
What do you suggest?
Engine cooling fans are two side by side in front of radiator
Wednesday, February 23rd, 2022 AT 6:01 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

In addition to checking the fuse, confirm it has power to and from it. Here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Next, I attached the wiring schematic below. If I am reading it correctly, power is constantly supplied via fuse 8 in the battery junction box. Is that the one you are referring to?

If so and the fuse is good and there is power flow, go to the blower motors. There should be two wires. Locate the light green wire with a violet tracer and confirm there is power to it (12v).

If there is, next, check the black wire (which is ground) for continuity to ground.

If that is good, then we need to check for a signal ground at the PCM. That is supplied via a light blue at the motors. However, there will be no ground until the system reaches a temperature it is needed, or the A/C is on.

Do this and let me know what you find.

Take care,

Joe

See pics below.
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Wednesday, February 23rd, 2022 AT 7:13 PM

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