Most likely from the thermostat housing area making it's way onto the exhaust. Exact source location(s) to be determined, but I have had some leaking from that area for quite some time, just not this bad! As in there is a steady drip right now. I've been avoiding fixing it due to the chronic broken bolt issue that often comes up there. Hard part will be determining if this is the leak or if there are other leaks in that area. Anyone noticing anything obvious, besides the leak at the thermostat housing? There is coolant under the heater hose here. I have no idea if it's the hose itself or dripping into the hose: If I end up replacing this heater hose (DAYCO 88394 ???, GATES 19661???), what size OE style hose clamps do I use? The upper radiator hose seems fine, except for a mechanic used a worm clamp which I intend to replace with an OE style spring clamp which I already have. Unless I am missing something, is there anyplace else where coolant can drip down onto the exhaust? It is unclear to me how a leak in the front of the thermostat housing can get onto that hose in the back as well. If I can't find another obvious leak, seems to me that the thing to do is to fix this one with Fel-Pro 35477, with RTV on both sides, and reassemble everything except with OS style clamps on the thermostat housing hoses. Would need to get the thermostat housing clamp for the smaller hose though.