2004 FXT 5MT
I got my Fozzy in September '17 and starting having this bizarre issue where the engine heat sensor goes from normal temps, to almost in the red, and then sometimes the needle is all the way as far as it can go. And then a moment later it's back to the mid-line. I talked to a Subaru specialist shop and he said it could be an air bubble in the coolant or the head gasket, although if it was the head gasket it should be overheating all the time. What else could it be?