Drivers facing frozen windshields without a working heater are at risk of reduced visibility, which can compromise road safety. Using improper defrosting methods, such as pouring hot water or using metal scrapers, can lead to cracked or scratched windshields. Additionally, idling the car to defrost is inefficient, environmentally harmful, and may violate local 'no-idle' laws. Preventive measures and proper defrosting techniques are essential to minimize these risks and ensure safe winter commutes.