1971 Jaguar XKE

Engine Cooling problem
1971 Jaguar XKE V12 Two Wheel Drive Automatic 48000 miles

the temperature is fine as long as I am out on open road but when I get stuck in traffice the fan does not come on and then the car temperature rises. Is there a simple way I can check to see what is causing this problem?
Jaguar one
September 29, 2010.

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