Hi. I have today fitted a new cooling fan thermostat to my AEG oven, like many others before me!!!! All seemed fine, at first, however, as the oven heated up, the cooling fan tried to start up, and it just turned feebly round, very slowly, not enough to cool. Although the oven, worked longer than 15/20mins like it had before replacing the thermostat, it still displayed the same syptoms, only this time after 40/50mins. Any other ideas please??