My motor runs cool....maybe too cool?

jcolman said
I just changed the coolant to Prestone 50/50 prediluted. I don't know what was in the system before. But the car ran cool as soon as the colder weather set in before I changed the coolant and runs cool now.

Well, it's not your problem, but I never buy 50/50. It's a ripoff. You're paying for HALF water. Think about that.