I have a 2002 Ram 1500 with the 5.9 engine. I can smell antifreeze . I can't find the leak. It takes about 3 months before I have to add to the overflow bottle and I don't see any drips on my driveway.When I was changing my oil filter there was a couple drips of antifreeze on the outside of it. Any idea where this could be comming from? The heater hoses appear to be ok.

 

Check around the thermostat gasket, these have a tendency to dry rot and crack over time and would cause the smallish leak you describe...

 

I had the same issue last year i was smelling antifreeze but not seeing any leak and no drop in coolant level , and after a long search i found a tiny drops on the radiator from inside it gave me headache to find it , but in ur case as Hammer said check the gasket around the Tstat, good luck

 

check the tanks on the radiator too, I had a similar problem with an old 5.2 Dak I had, just a tiny weeper that drove me crazy until I pressurized the cooling system and watched it start leaking out

 

I'll check the thermostat gasket, Any idea where the antifreeze on the oil filter is comming from?