I was driving down the road the other day and my vehicle temp got up to almost 260 (red lined). I was on the freeway so I couldnt pull over right away. I turned my heater on and with in a matter of minutes it dropped back down to 210 (normal). Since then my temp has not gone over 210.
I believe if it were my radiator or thermostat the problem would continue.
Does anyone have an idea why this happend or what I can check to figure out what the problem is.