1999 RAM 3500 Heater stinks

[bignoisey]

If I turn on the heater, I smell anti freeze. The radiator coolant level is not dropping appreciably, so I suspect only a small heater core "seeper" leak. I don't see any sign of coolant in the heater areas I can see without disassembly. Has anyone else had this trouble in a '99 era dodge van? Has anyone removed a heater core before? How big a job is it? I have A/C so that might complicate things. I can probably reapir it if I can get the core out.