Ford Fusion radiator fan problems

Our Ford Fusion (2003 model) engine radiator fan has just stopped working but kicks in when we turn the A/C on (and the water leaks out of the pressure cap on water bottle). We've just bought a new thermostat and had it fitted at the garage and it's still the same ... does anyone know what the problem could be?

Asked on 2 August 2016 by Richard Gorman-Jones

Answered by Honest John
I'd guess that it is separately switched when the a/c is used but the engine block temp sensor/sender switch that normally switches on the fan has failed.
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