well i had the same problem before (and still have it). in traffic, the gauge will be up to A/L. So i though it was my thermostat. Got a 180 degree one (cooler than stock), and now at highway speeds of 40 or more the gauge stays at N at the highest, but if I am stuck in traffic it will go up again to A. And you guys know how it says that these cars should run on Motorcraft GOLD coolant with a 50/50 mixture?? And I had my system flushed with green coolant 50/50 again. Did the strength test and was all good....so could it be the coolant? because the car wasn't doing it beofre I changed to the green coolant.
**99 E0 CSVT
