I've been having some coolant leaks in the last while....nothing of big concern (lower hose). Early this week, I started losing quite a bit more from the back of the block, on the left side as you are looking at it from the front.
I got it pressure tested yesterday (thought maybe a head gasket) but it turns out to be a tiny (~5" long) rainbow shaped hose on the very back of the block, in front of the firewall. It defintley has coolant in it, but I have no idea what it is or what it does.
Any ideas? Anything will help at this point.
thanks.

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