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Old 07-03-2014, 04:22 PM   #1
defiance
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Default What a nightmare.....

Two weeks ago I thought I had a defective cooling fan. I sent my newly acquired Ford Racing cooling fan (3 months old) back to Ford Racing and they sent me out a new one.

Today I received an email from Ford Racing saying that their engineers looked at the fan I have sent them, and after testing found the fan working just fine (both speeds). Later that day I receive the brand new fan, and sure enough after the install, it fails to start.

Once again I checked the relays, fuses, wiring and the fan plug. I even checked the underside of the fuse box to make sure there are no burn marks as one member recommended. Everything looks fine. I am completely stuck guys, I do not even know where to begin other than putting it in a shop, which sucks, for a simple cooling fan issue.
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Last edited by defiance; 07-03-2014 at 04:25 PM.
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Old 07-03-2014, 08:08 PM   #2
charliebrown266
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does the fan come on if you turn the a/c on? have you checked the thermo switch to see if its working?
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Old 07-03-2014, 10:01 PM   #3
defiance
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Originally Posted by charliebrown266 View Post
does the fan come on if you turn the a/c on? have you checked the thermo switch to see if its working?
No it does not turn on with ac either. What is a thermo switch, the thermostat ? I replaced the thermostat 3 months ago as well, but I can check it again if that's what you are referring to.
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Old 07-03-2014, 11:01 PM   #4
AzPete
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The fans operate according to temps of the engine plus they kick on high when the a/c is turned on. Need to locate those sensors and see if they are functioning. Cannot direct you on their location at this time.
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Old 07-04-2014, 07:57 AM   #5
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Fan comes on based on cylinder head temp. Does your instrument cluster temperature gauge appear to work?
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Old 07-04-2014, 09:45 AM   #6
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Fan comes on based on cylinder head temp. Does your instrument cluster temperature gauge appear to work?
Yes, the gauge works just fine. And to followup on AzPete's post, I believe our cars only have one sensor, water temperature sensor in the thermostat housing in a v6, and a Cylinder head temperature sensor in the v8.
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Old 07-04-2014, 09:47 PM   #7
charliebrown266
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if the fan doesn't come on with the a/c i would say it's not the thermo switch! have you checked all your fuses and the relay
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Old 07-04-2014, 11:45 PM   #8
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if the fan doesn't come on with the a/c i would say it's not the thermo switch! have you checked all your fuses and the relay
Yeah, checked them today for the third time. Was hoping for a miracle. This is the most frustrating problem I've had with the car
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Old 07-05-2014, 09:29 AM   #9
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Have you used a volt meter to check for power at any of the relays and plugs? That is the only way to really verify what is happening.

As a temporary fix to drive the car, you could wire the fans to a manual switch that you turn on when the car is running. That would also verify the fans work.
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Panama City, Fl.
I wake up in the morning with nothing to do and by supper time, I have half of it done.

2008 GT Vert, stock
2000 Lightning, s/c, tuned, Basanni, built tranny
Previous Mustangs:4 - '66 Coupes(silver/blue/grey/red) '87 GT HO, '00/'02/'07 GT Vert(red)(grey)(black), '68 Coupe, '11 GT/CS
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Old 07-05-2014, 11:38 AM   #10
slickman
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Pull the relays out and bench test them.
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Old 07-05-2014, 11:38 AM
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