do you hear a gurgling/running water sound from behind the dash? could also sound like a squeeky hamster wheel gone awry... that's a good indication of air in the heater hose and thus air in your cooling system. However, given the fact the radiator was installed and the issues began at the same time, I'd have to guess you may have installed a clogged radiator. When it's cold, pop the radiator cap off, run the car... check to see if you see the coolant moving, indicating the coolant is moving thru.
Also, why did you replace the radiator? were you having issues with cooling before hand? maybe the issue didn't start with the radiator but could be a faulty water pump, thermostat or something more severe... hopefully you're not blowing smoke out of your tail pipe...
Finally, guess it could just be coincidence your heater's vacuum valve isn't working any more... preventing water from even flowing through your heater hose.
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