86 Syncro. When I turn on the rear heater I get a strong anti freeze smell, even fogs up a bit. I don't bother with that one anymore. Now that I've replaced the front heater motor I'm getting a very slight sweet smell in the front.. What's up?

I do have a a drip of anti freeze at #3 cylinder head. My heater core was in great shape in the front.

Thank you,
        Andy