There are many reasons why the car heater is not hot. The most common ones are the following:
1. The car engine temperature is low after the cold engine is started. It is best to turn on the heater at this time. It won't get hot. This is normal and can be solved after the engine warms up;
2. Check whether the vehicle's refrigerant is sufficient. If it is not enough, the heater will not be able to get sufficient heat and will naturally not be hot. , when this happens, we can only solve the problem by adding antifreeze;
3. The thermostat is opened too early, causing the coolant to be in a large circulation state and the coolant temperature to remain at a low state. ;
4. There is air blockage in the engine cooling system. The air blockage causes poor circulation in the cooling system, causing the water temperature to be high and the warm air to not be hot.