What to Do When the Car Heater Is Not Hot?
2 Answers
The methods to deal with a car heater that is not hot are: 1. Check if the filter is dirty or clogged; 2. Check if the control cable for the heater box's hot and cold air flap is detached, if the heater fan blade is damaged, or if the flap is detached. The reasons for a car heater not being hot include: 1. The thermostat is always open or opens too early, causing the cooling system to start the large circulation prematurely when the external temperature is very low; 2. The water pump impeller is damaged or slipping, resulting in insufficient flow through the heater core, preventing heat from rising; 3. There is airlock in the engine cooling system, which leads to poor circulation in the cooling system, causing the heater to not heat up; 4. The filter is dirty or clogged, resulting in insufficient airflow or poor distribution of hot and cold air, preventing the heat from the heater core from being released.
I've been driving for over 20 years and it's quite common to encounter issues with the car's heater not producing enough warmth. Most of the time, it's due to insufficient coolant or a stuck temperature control valve. Check the coolant reservoir level - if it's below the Min line, try adding some coolant mixed with distilled water. Additionally, the heater ducts might be clogged with dust or small debris. If you're cleaning them yourself, be careful around the fan blades to avoid hand injuries. This issue shouldn't be neglected during prolonged winter use, especially in northern areas where temperatures drop below -10°C. Without proper heating, windshield fogging can severely obstruct visibility and lead to accidents. I recommend doing basic troubleshooting first. If the heater still doesn't work properly, have a professional mechanic inspect it immediately. Replacing small components doesn't cost much, but waiting until bigger problems develop can be troublesome. Regular coolant changes during maintenance can prevent this situation.
