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It sounds like you still have a leak somewhere, maybe it's a hose clamp that wasn't tightened or another leak. You should check the coolant level in the radiator, not the overflow bottle. If the system has a leak it won't create a vacunm to draw in the coolant from the overflow, the radiator could be very low. The sound you were hearing was air bubbles in the heater corem maybe the coolant wasn't topped off.. If the core was leaking there would be coolant dripping on the passenger's side floor.
I'm pretty sure if it were the heater core, you would have antifreeze soaking your carpet, and the inside of your car would smell of antifreeze. Your inside windows would also fog up when you turn on the heater.
You'll have to rejoin or replace the rear heater core line that leads to the rear from the front if it's leaking like described.
One might be able to use a section of rubber hose with clamps, if the two ends are flared with a tool, hoping that the pressure won't make it leak at these two joints.
Or, as suggested in the question, one might cap the line, disabling the rear heater. Check with your local auto parts store for a rubber cap that can block the end. Maybe try a place like Lowe's which stocks a wide variety of plastic, rubber, and metal plumbing supplies that might be helpful.
Under hood at the firewall on passenger side bulkhead should observe a set of heater hoses that run off a tee fitting, jump the Tee with a lenghth of same size hose to jump out the rear, if not locate the rear heater core and jump the heater hoses together at the rear by means of an adjustable fitting and two hose clamps.
your lines going to the back may be plugged up and the antifreeze is not able to flow through the rear heating system. disconnect your cooling lines at the back and see if there is coolant in both sending and return line hook a garden hose to the lines see if you can flush out the whole heater system in the back
There's a good possibilty that you have a vacuum line off. When the heater controls lose vacuum, the heater will go into the defrost mode. There should be a small line, about 1/8 inch in diameter, that goes from the engine to the firewall. It's most likely on the passenger side.
Rear heater problem: find under the hood where is hose for cooling liquid goes to front heating core! you will see there also vacuum tubesgoing in to little valve ! disconnect the vaccum tubes ( engine off) and spray in wd 40 in to the vlave ... valve is stuck and wont open flow to rear heater !
you do not have to replace tha thing . its very well made and because you dont turn this often in summer it gets stuck. i had same problem. also make sure vacuum is working - Engine running turn rear heater on - vacuum sucks to open valve. and before that make sure fuse is ok .
for rear AC mine does not work either and it is leak on pipes that go from front to rear .. 10 feet of pipes and tubing $$ expensive repair ... forget it ... open the window...
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