Having enough power to light up a test light and having enough amps to power a fan motor are two different things. What is the condition of the plug? Does it look burnt at all? You must remember that the fan requires a lot of amps to function. Corrosion on the terminal and inside the actual wires acts as an insulator and does not carry electricity. This taxes the electrical system and causes the fan not to work.
I took a double look at it, hoping I missed something, the metal pins on the female and male ends are all in good condition (besides dust bunnies). The wires looked decent, except maybe to the coolant sensor, but that's more than likely unrelated (I'd like to believe). The clip is broken, but i've done wiggle play with it at hot (what I think is hot) temperatures.
So so tired of driving my rent's mazda 6, I miss my gas guzzling baby
Decided to try some testing, and, well. Not good. I had an extra CCRM box but it's a code R, and my mustang's is a code K. So I figured, might as well try it. The fuel pump relays turn out to be the same and the car fires off with the R (not meant for it) on it. It works just like it did before. The fan wouldn't move, I had the car run all the way near the red (based off the gauge cluster). At this point I doubt it's an error in reading the gauge cluster..
When I shut her down cause she was getting so hot, the overflow reservoir started to gurgle, and, finally it poured out the top. Covering the sensor, dripping down onto the ground in decent size portions, steaming into a vapor.
I think the car is getting hot enough at this point, with or without a way to accurately read temperature. The fan did not turn with the a/c on max, and did not turn through any of the testing between the two CCRMs.
I also did check the anti-freeze before starting the experiment, the levels were resting at the cold mark in the overflow reservoir. So it wasn't because there was too much antifreeze.
I'm not entirely sure if I can rule out the CCRM just because they're different codes and the code R was from like a 2001 mustang. But I more so doubt it's that or temperature.
I also read (a few moments ago), that unplugging the ECT would make the PCM respond in a safe mode and have the fan run constantly to protect it, the only difference is the guy said it in response to a sn95 from 96-98.
wmburns (he's going to think something like "what's going on in the 5.0 section that I was tagged?")
http://www.stangnet.com/mustang-forums/threads/ccrm-help-pls.859053/
Final note, the antifreeze also did douse the connector to the fan when it poured out the top of the reservoir.