My 1997 mustang is overheating at low speeds or if I run the a/c at the coldest setting. Without the a/c runniing it will overheat if I run below 50 mph. At 55+ it stays in the middle of the guage all day long. If I turn the a/c on at the coldest setting it will overheat within 10 miles. If I back it down 2 clicks from the coldest setting it will run ok as long as I am driving 55+. At three or more clicks from the coldest setting it runs close to normalexcept at idle, it will overheat! Has anyone had a simular problem that can direct me in what direction to proceed? I was loosing water until about 20,000 miles ago, I changed the water pump and gaskets. I still loose water but not at a high rate.