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1987 Ford Thunderbird Overheating - Engine
Question: 2.3l t-coupe t-bird overheating when at idle, fan dosen't engage till it's in the red zone, replaced hoses, thermistat, flushed, checked pump, pump has no play in shaft, it's a little better, but not fixed, don't know what else to do.
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Technican: Hi,
It sounds to me like the fan is simply coming on too late. On this vehicle, the fan is triggered through the computer by the engine coolant temperature sensor. This sensor is a 2-wire sensor on or near the thermostat housing, and is notorious for such failures. If it is telling a lie to the computer regarding the engine temperature, the fan will turn on at the wrong time. Hear are the approximate voltages you should get when you backprobe the connector with everthing hooked up and the engine turned on.
ECT Sensor Reference Signal Open Circuit (Volts-DC) 4.9
Signal Level Backprobed @ 0F (Volts-DC) 4.2
Signal Level Backprobed @ 30F (Volts-DC) 3.8
Signal Level Backprobed @ 70F (Volts-DC) 3
Signal Level Backprobed @ 100F (Volts-DC) 2.1
Signal Level Backprobed @ 130F (Volts-DC) 1.5
Signal Level Backprobed @ 160F (Volts-DC) 1
Signal Level Backprobed @ 190F (Volts-DC) 0.7
Signal Level Backprobed @ Rad Cooling Fan Turn On (Volts-DC) 0.5
If the voltages are out of range, replace the sensor. Also check the connector to be sure the terminals are clean, making good contact and no wires are broken. Here's How To Get Guaranteed Solutions In Minutes
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