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Cooling Fan Failure

  • Thread starter Thread starter P J Moran
  • Start date Start date Jun 18, 2019
P

P J Moran

New Member
Oct 8, 2003
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Jun 18, 2019
#1
  • Jun 18, 2019
  • #1
I have an '03 Mach 1. The cooling fan has quit working (high speed, at least). Here's what I have discovered:
- Jumpering directly to battery yielded lots of sparks, but no run with power to either terminal
- The high speed fuse (50a) is blown. The low speed fuse (30a) is not.
- I can turn the fan by hand, but it's far from free-wheeling. It also squeaks as I turn it. It's like it has an o-ring on the shaft, or something like that.

I have not yet tested to see if I'm getting full voltage from the relays, yet. But, what I've found points me to a bad fan.

My jumpering was less than ideal, but I think it should have been adequate to test the fan. Whatever I did is drawing plenty of current.

Assuming a new fan is in my future, any recommendations for replacement? Stock replacement from Ford? A better aftermarket version?
 
P

P J Moran

New Member
Oct 8, 2003
10
0
1
Jun 18, 2019
#2
  • Jun 18, 2019
  • #2
BTW - It looks like the motor itself is a replaceable part. In other words, I don't have to replace the whole fan assembly. True? If so, which one?
 

wmburns

SN Certified Technician
Aug 14, 2009
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Houston Texas
Jun 18, 2019
#3
  • Jun 18, 2019
  • #3
P J Moran said:
I have an '03 Mach 1. The cooling fan has quit working (high speed, at least). Here's what I have discovered:
- Jumpering directly to battery yielded lots of sparks, but no run with power to either terminal
- The high speed fuse (50a) is blown. The low speed fuse (30a) is not.
- I can turn the fan by hand, but it's far from free-wheeling. It also squeaks as I turn it. It's like it has an o-ring on the shaft, or something like that.

I have not yet tested to see if I'm getting full voltage from the relays, yet. But, what I've found points me to a bad fan.

My jumpering was less than ideal, but I think it should have been adequate to test the fan. Whatever I did is drawing plenty of current.

Assuming a new fan is in my future, any recommendations for replacement? Stock replacement from Ford? A better aftermarket version?
Click to expand...
To me one of the biggest clues is the fact that the fan bearings are not free spinning.

Do you have an ODB2 scanner with bi-directional control? If so this gives you the ability to "command" the fan to run. Much better way to test.

ForScan ODB2 scanner w ELM327 USB

ForScan ODB2 scanner w ELM327 USB

While working on your car have you ever wanted: to find an ODB2 operational PID value (say fuel pressure or MAF)? How about graph a PID value over time? Or compare multiple PID's over time? Access a bi-directional PCM control such as test a...
www.stangnet.com

IMO a stock replacement fan is the best option.
 
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P

P J Moran

New Member
Oct 8, 2003
10
0
1
Jun 19, 2019
#4
  • Jun 19, 2019
  • #4
I don't have a scanner. But, if I used that to turn the fan on, and the motor is bad, I could blow another $5 fuse, at least, right?
 

COramprat

...I can take it. I think.
20+ Year Stangneter
Mar 2, 2003
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Jun 19, 2019
#5
  • Jun 19, 2019
  • #5
I had no issues with a over the counter fan from any of the parts houses. I've replaced several over the years on various cars including my 96 GT and my son's 98 Cobra.
 
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