Disconnecting the cylinder head temp switch to bring on the fan is an indication that the cooling fan system is working correctly with no electrical issue. Is the engine actually overheating with the coolant bubbling in the expansion tank? The temp gauge on these is not very accurate (in common with many modern cars) .I ran my old Focus for a few miles after a hose blow out ,with very little water in the engine, and the gauge did not move from the centre position. Something else to remember ,the engine temp sensor is not in the coolant on the 1.6 engine .
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