I have 58 plate A3s line 2.0 tdi on 56 tho miles, with is bad weather we had I've not used it for a week upon starting it today and driving 3 miles, when I turned car off the fan or fan noise was still goin the temp gage was at normal/ below normal due to short trip is this normal to hear this nose never heard it before but since this weather it's happend 2 out of 2 times going out. Show I be worried or is it normal