Hello. Can somebody give me information about the operating temperature on a 1995 5.0? I replaced the engine; the new engine has approx 20K on it. But, before the engine, I was still experiencing temperature changes on the temp gauge (factory at first, then aftermarket) that did not happen in the car's younger days. In its young days, the gauge never moved. I understand that running the AC in traffic will cause the temp to go up. But, if I turn on the AC on the highway (70 MPH), the temperature will go up about 15--20 degrees. When I turn it off, it goes back down. There is a 195 thermostat on there right now, and it usually sits around 200. If I see it go up to 220, I shut off the AC. What's strange is that it moves at all; it never used to move. Is there something wrong? Thanks!