Mustang 2.3 cooling problems

[DAN-MAN]

Well, I don't have an answer to your first question, but I do have some input for your second. I use to have an old '90 LX hatch 4 auto. The way you described your temp guage acting is alot like mine was. The car never leaked coolant and I never had to replace the thermostat. It never had any problems, even with the guage sitting just narrowliy above the cool indicator. While it was sitting, not moving, it would move up. But when you drove it down the highway the guage would go back down. My guess is that's just how they are. If I were you I wouldn't think about it that much.

Daniel.