Antifreeze / coolant leak... GRRRRRR!!!!

[ZeroSix]

Q: which / what hoses should i be looking at?

[Y33TREKker]

Q: which / what hoses should i be looking at?

For determining when the thermostat has opened - both hoses going to the radiator, although I'd say it would probably be the one going to the top of the radiator that would get hot once the thermostat opened.

For determining where a leak may be occurring - all of them.