IF it's a big end, the best case scenario would have been drop the sump, check the crank journal was ok, and slap a new bearing in.

The noise that your engine is now making I would suspect you may well have mashed the bearing up, or at least spun it, in which case you may well have ovalled the crank journal

/ scored it badly enough to need a regrind

(or replace).

.

.so you'd need to fully strip the bottom end measure everything up and take it from there.

You then need to consider if you have contaminated the rest of the engine with bits of bearing, so you'd be inspecting everything for damage and sorting as required.

.

.potentially a big job.

On the plus side- it may not be a bearing, you may have simply destryoed the water pump or the a/c compressor.

.

.how was the water temperature behaving when you were running it?

If I was in your position the first thing I would do is drop the engine, then strip the timing belt and inspect the water pump.

If that's ok, then I'd flip it and pull the sump the inspect all the big end and mains bearings, and the crank shaft.

.

.if it's any help I've got a couple spare crank shafts
