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I have an '04 with the 4.7 engine. Recently she has been running hot while at stop lights/drive thru's etc, but would cool down once you get moving again. It seems now that it doesn't cool down as much now when you get up and moving. The coolant level is full. What should I look at next? The fan runs all the time as it is a mechanical, not electrical fan. Should I replace the thermostat? I don't want to parts swap if something isn't broken....just looking for a little direction.