Engine Overheating?

2003 Taurus cooling fans. Turn on when Car first starts, once they stop they never come on again. Car overheating. Replaced thermostat and fan relay. What else to check and where located please. Thanks in advance

Also does not come on when ac is on. Another thing to add, I've got a odd looking sensor of some sort that appears to not be in the correct place. It's got a series of coils contained in a metal vented housing. It was found just sitting atop the fan housing zip tied in place. Not my car, so I know very little about it. Thanks

Thanks for the quick response. I am at work right now but will upload a photo when I get home. The thing that bothers me is that when you first start the car the fans run for a few minutes then shut off. Aside from the pcm, is there anything else that triggers the relay? I have Alldata for all My cars, but this is a friends car. A wiring diagram would be nice at this point.

Here is the aforementioned "mystery part ". Any clues? I am about to do some more diagnosing and hopefully get this thing fixed. Thanks for all your help. Greatly appreciated.

Still haven't found exactly where the resistors Home is. Even tried replacing the coolant temp sensor in case it was sending inaccurate readings. Tested every relay and wire continuity, and everything is checking out. Could I possibly be dealing with a bad pcm? Not sure what else to check at this point.

Okay, so last summer it started to overheat and replaced the water pump and radiator was fine until about March or April when I was taking my kid to work. I looked down and seen that my temperature gauge was on the "H". I pulled off the freeway and sat for thirty to forty five minutes then started it up and got it home the next couple of days it was fine then all the sudden the same thing happens and then periodically after that. Eventually I blew a head gasket and had that replaced all with new wires because they were melted anyways. I also replaced the water pump again because I had replaced the reservoir tank with a clear one and noticed it was rusty all over again. So I figured the one I first replaced it with happened to be from a pick and pull so I thought maybe that was it. So after taking out the water pump and seen that there was no reason to replace it, although I still put the new one from the parts store on anyways on my way home got hot again. My question is, can the heater core make your car overheat if it is plugged, and can I bypass it? I have noticed that my fans do not stay on when I turn the car off even when it is overheated could that be the issue?

My car has MFI OHV engine that recently started over heating and coolant is spraying out from coolant tank. Since it started I have replaced the thermostat, water pump, radiator cap and flushed system out several times. Also, radiator seems to be okay getting hot on both sides like its working and checked hoses an do not see any leaks. Since doing all that it is still over heating. However, it is not over heating instantly it is after driving the car for a while that it starts to over heat. I am doing all work at home since I cannot afford to take it to a repair shop. Other than a blown head gasket is there anything else I might be missing?

What is the name of the chemical test?

Engine Cooling problem
2001 Ford Taurus 6 cyl Front Wheel Drive Automatic

small leak at thermostat, and in heater core lines up against firewall, no sound or looseness from water pump. Ifboth things fixed, will overheating stop?

The hose to the coolant resivior loosened and started leaking coolant. As a result the car started the loose speed and the engine lights came on. We pulled over and it started to smoke/steam. It would still start but we didnt want to risk further damage. 2 days later it wouldnt start. Im told head gaskets are bad. What would you suggest.