95 Ford Taurus COOLING FAN HELP

GILHAMMER24

MEMBER
1995 FORD TAURUS

Cooling fan not cycling properly. Fan will come on when I energize AC and will run constant. Fan will not always come on when engine gets hot. Sometimes I can shut the engine off when hot and restart and fan will come on. Does this sound like a relay prob or sensor prob. I am thinking ECT sensor but I really don't know exactly how the system works or where the components are located.

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GILHAMMER24

MEMBER
2 POSTS

Its a 95 Ford Taurus 3.0 single cam (have had this car for four years 150K miles on it currently)

Has not overheated or boiled over yet. The temp guage has "NORMAL" in between the C and H. In normal opperation the needle hangs around the R in NORMAL. I have had problems with cooling system leaks (replaced radiator and two hose) so I am constantly watching the temp. Also the radiator cap comes loose every once and a while and I will loose coolent ( has done that on both radiators). Currently I have no leaks and radiator stays full of coolent. The needle has risen all the way up to the A in NORMAL. When this happens I turn on heat to cool coolent off, or just use AC to prevent this from happening (fan runs constant). I have been investigating and have notice that the cooling fan is not running when the engine is getting hot. I am thinking that it is not a relay prob because fan runs when AC is energized. Maybe that lower fan speeds are gone? I have not done any testing because I am not familar with the electrical sys. I am an electronics eng. So I can find my way around and test circuits if I know how they work. I will check my fan motor windings for contenuity on all speeds. How can I check the ECT and were is it located? How is the fan engaged in relation to coolent temp, what speeds when? ?