volvo s80 diesel auto cooling fan
 

hi i just bought the above car, and driving around town car seems to be quite slow to respond to accelarate, after a 30 minute trip around pretty heavy traffic, the cooling fan was still running after engine switch off for around 5 mins, so i put key inignition and turned to ii and the fan stopped , but car really struggled to start after, almost flattened battery, any suggestions or answers would be greatly appreciated. thanks