可能有两种情况:1. 水泵不工作, 所以发动机温度很高, 因为冷却液在水泵无法工作条件下,无法冷却发动机, 同时冷却液液也无法把热量送到heater core under the panel of your car. 所以, 你即无法得到热风, 也无法冷却发动机.
2. there is air keeping in the heater core, it will prevent the coolant from circulating, and you can not get heat from your engine.