No pressure in the radiator hose, died twice in town only a mile apart

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No pressure in the radiator hose, fan kicks on and off and regulates heat and thermostat is working, but the car died twice on the same road in town when I was at almost a completely stop and had trouble wanting to start. Topped of fluid last light and it was all gone when we check today after driving roughly 45 miles. (I bought the car yesterday) it idles fine, but before the whole motor rocked and shook, but we fixed that, motor mount bolts were loose. Just don't know why there is absolutely no pressure for the radiator but everything else is working fine.