Well on Friday I had the top up coolant warning light on the drive home ... so I stopped topped up and then 20mins down the road it came on again.

After investigating I found a bolt hole (I think) without anything in?? So I tried a few different bolts and found on that fitted ... the hole even has a tread.

I think the leaking has stopped but I’m a little worried what was attached there in the first place?? It’s located (if you’re standing in front of the car) to the right, under the MDF??
Can you help please??
Many thanks,
Matt