If the coolant system was full and your heater hoses didn't have any coolant in them you'd be looking at some very serious blockages... frankly, I don't see how it's possible for the system to get that clogged up as it would have to be clogged on both sides. How did you determine the heater circuit was empty? And was the coolant system actually full?
Lack of hot air when the heater is on is usually due to the VSV for the heater control valve dying. It's easily bypassed until it can be replaced... it's been posted on here before, try searching for the specifics if you think that may be relevant.
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