2005 - 2014 MustangsDiscussions on the latest S197 model Mustangs from Ford.
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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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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.
Panama City, Fl.
I wake up in the morning with nothing to do and by supper time, I have half of it done.
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.
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.
+1. You most likely have an electrical issue. you need to narrow it down to where the problem is, using a voltmeter. Could be that power to the relays is not there (although both low and high are different fuses), or the pcm signal to trigger the relays (ground one side of the coil) is not occurring. Until you track it down to a specific part of the circuit, you can't be sure what is causing it.
Mike - 2005 Stroked/Forged/Cammed V8 (5.0L.); twin-turbo build underway
- 2006 4.0 V6 with PH Turbo and TR6060
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