Coolant leak !

hi everyone, i have a pretty bad coolant leak under my A2, its located (looking up from underneath car) to the left of the timing belt cover/above the cover. I was just wondering what everyones thoughts were on what its most likely to be so i can buy parts now so i can be back on the road ASAP. ive attached a photo to help a little with diagnosing what it could be. My guess is the water pump which would mean i may as well get the timing belt done while im at at. 17238604_1052072601563275_583229964_n.jpg
 
Very hard to tell from your pic and description, but yes - looks like the leak is from the housing. You might find there's a stripped thread and one's not holding it in place any longer but as the saying goes, this is just stabbing in the dark. Likely best to get it properly inspected by a garage that might offer free diagnosis at least.
 
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