does the car start rough or run rough at all. I had some of the same symptoms as you, coolant kept disappearing although I couldn't see it anywhere. I changed all the stuff people said, coolant temp switch, etc. It ended up being a blown head gasket. Even the dealership couldn't find it. My plugs weren't even fouled, but when i had them out I could see coolant sitting on top of the cylinders. Also you'd probably notice white smoke when you start, which is the coolant being burned up. let me know where you're at with the problem.
ryan
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