The coolant sensor also measure the SPECIFIC GRAVITY of your coolant mixture.
If there is too much water, the light will come on also.
I would try to empty the reservoir, and then refill it with 100% antifreeze, and drive around for a day or two, and see if the light goes out.
Pete...
Pete... 98.5 SE Sport Duratec ATX (P66L) Black Clearcoat on Greystone DOB 11/21/1997 DOP 12/25/1997 PIAA 510 Super White Driving Lights SVT CAT-BACK EXHAUST (No Resonator) DiabloSport Chip (LPQ4) - Engineered To Raise Hell Too many other mods to list... Sounds sweet, runs quick... Crazy Horse Dyno @ 121.4 WHP/129.6 TQ
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