I have coolant leaking from somewhere ander my '03 4.7. It only started showing up when the cold weather moved in. Some mornings I see a larger "puddle" but it does not leak everyday. I have crawled underneath to try and see where its coming from, I saw some coolant on my oild filter the other day. I have used my works wash bay to clean off the engine block
to try and help so I could see up highr on the engine. (yes my engine had been sitting all day)
I have topped off the overflow bottle too the full line to see if its loosing coolant and it is. There is not any discolored smoke from the exhaust. I looked at the oil on my last oil changed and didn't noticed any water or milky fluid, and its not on my dipstick (I checked yesterday)
Could this be a cold water leak from a failing water pump or worse, head gasket?