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Always back-flushed, but more often than not, any plugged core that is unplugged tends to leak! 
You could try an old speedo cable (just the inside part) to 'snake' out the clogs...
 the aluminum, copper and solder on heater cores are thin to begin with. Add some corrosion and some probing and you've got a leak. Not much to loose though... with no heat you'll probably be going into the dash anyways.
Scott B.
"I'm a self-made man... I started with nothing, and I still have most of it!"
68 360 rusty B'cuda 'vert (GO Fish)13.59@ 98.72 mph
69 340 GTS stock 14.18@ 95.60 mph
01 5.9L Ram 1500 Quad Cab 4x4
01 3.5L 300M 16.23@ 86.97 mph
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