93 Subaru Legacy - 'clicking - nothing - glycol everywhere

Hi everyone,

I'm new to the forum, so please forgive me if this has been answered before.

About a month ago I noticed (in my 93 legacy AWD turbo) a sort of 'clicking' sound comming from the engine bay, that was proportionate to the speed of my engine (when I revved faster, so did the clicking). I didn't take much notice of it at the time, because after a couple minutes it would go away, and I'd be alright.

However I believe it's linked to this morning's mis-hap. About a block from my appartment I noticed the check engine light (dumbest spot for a check engine light ever, hiding right behind the steering wheel) and some smoke/sweet smell. Got it to the appartment parked, opened the hood, and a plume of smoke rises. Definately coolant (no question, green, slimey, sweet smelling) all over my engine bay.

The smoke seems to be localized comming from the back drivers side of the motor (right where the coolant filler is), however not sure if that's the actual location of the problem.

I've been told that it could be radhose - head gastket - or a water pump.

Any opinions would be greatly appreciated.

Thanks
Brendon