2002 XLT Overheat Prob

2002 XLT, 4.0: I get a strong smell of coolant while stopped at a lite in city traffic(no coolant leak seen), then the engine idle speed increases to approx 1500RPM. A few minutes later, the temp gauge needle starts to climb. Getting up to 30 or 40 mph then seems to bring needle down. No problem at highway speeds. Brought to dealer last week, they pressure tested cooling system & decided thermostat was defective. Identical problem recurs a week later, after 700 miles of driving. Now dealer thinks it's fan clutch. Any ideas or suggestions?
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Geoff R
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