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THERE ARE TWO COOLANT SENSORS ONE IS THE COLLANT SENDING UNIT SENSOR THAT SENDS Its SIGNAL TO THE GAGE. WHICH IS MOUNTED PASSANGER SIDE TOP FRONT EASY TO SEE. Note: Make sure to tell them what kind of dashboard gages you have (digital or mechanical) 2ndTHE ENGINE COOLANT TEMPERATURE SENSOR OR THE ECT SENSOR IS BEHIND THE THERMOSTAT HOUSING UNDER THE INTAKE SCREWED IN TO THE ENGINE. IT IS NOT EASY TO SEE BUT ITS THERE. REMOVAL: LOOSEN AND MOVE ALTENATOR OUT OF THE WAY NOW YOU WILL NEED TO USE A 3/4" CROW FOOT WRENCH TO GET AT IT. . BELIEVE ME THERE ARE A FEW DIFFERENT STYLES, ROUND PINS VS. FLAT PINS AND CHECK THE PLUG CONFIGURATION? LOOK AT IT CAREFULLY!!! YOU ARE BETTER OFF TAKING THE OLD ONE WITH YOU TO MATCH IT UP.
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Q: Where is the Engine coolant temperature sensor on a 2001 Mercury 4.6 liter?
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