I have a 1992 Ford Tempo, 85,000 miles. It has a 3.0, V6, automatic transmission. The problem is that when I'm sitting at an idle, thetemperature gauge reads quite high, around the A or L in NORMAL. If I rev the engine, it will fall back down to the O or R range. Of course, if the fan comes on the engine will cool a bit, but not where I'd like it. There is plenty of coolant in the system and the thermostat appears to be working. The heat in the car works fine. There is no coolant in the oil and I'm not losing any; the system remains full. Any ideas? Thanks.