Yodes

Been having all sorts of overheating trouble. Just Woke up to see a steady drip coming from my thermostat housing took the cover off and the gasket is gone/ all sorts of crap stuck on to the metal inside. There is a hose just behind the thermostat that comes out and runs along the drain pan of the engine. This hose was clogged any idea where this hose goes? I was thinking heater. My heater hasnt worked for a while. Will this affect burping? Thanks

mholme