What Are the Reasons for No Airflow from Car Heater?
1 Answers
Reasons for no airflow from car heater: 1. The thermostat is constantly open or opens too early, causing the cooling system to enter the major circulation prematurely. When the external temperature is very low, especially while driving, cold air quickly cools the antifreeze, preventing the engine water temperature from rising and the heater from warming up; 2. The water pump impeller is damaged or slipping, resulting in insufficient flow through the heater core, which prevents heat from rising; 3. There is airlock in the engine cooling system, leading to poor circulation and causing high water temperature and heater malfunction; 4. The filter is dirty and clogged, preventing the blower from reaching sufficient speed at various settings, or the heater core is faulty.