What to Do When the Car Heater Doesn't Produce Heat?

[Mariana]

Here are the reasons and solutions for a car heater not producing heat: 1. Issues with the cooling system: 1.1 The thermostat is stuck open or opens too early. 1.2 There is airlock in the engine cooling system, leading to poor circulation in the heater system. Solution: If there is always air in the cooling system, it is likely due to a damaged cylinder gasket allowing air into the cooling system. If the inlet pipe of the heater core is very hot while the outlet pipe is relatively cool, this indicates a blockage in the heater core, which should be replaced. 2. Problems with the airflow control mechanism: 2.1 If the airflow is insufficient or the distribution of hot and cold air is poor, the heat from the heater core cannot be effectively dissipated, resulting in inadequate heating. 2.2 The blower motor's various speed settings are not functioning properly, failing to reach the required speed. Solution: If the issue lies with the airflow control mechanism, first check the cabin air filter. The cabin air filter primarily filters dust from the air, but over time, it accumulates a significant amount of dust, reducing the effectiveness of the air conditioning system and decreasing airflow, which can make the heater seem ineffective. Therefore, it is necessary to regularly clean or replace the cabin air filter to ensure proper airflow. Additionally, the cabin air filter contains activated carbon, which helps absorb harmful gases, so cleaning the filter also contributes to air purification.