What are the reasons for insufficient heating in a sedan?
2 Answers
Reasons for insufficient heating in a car include: 1. Blower malfunction leading to issues with the air flap or air flap motor; 2. Faulty signal from the coolant temperature sensor; 3. Blockage in the heater core, requiring disassembly, cleaning, or replacement; 4. Damage to the water pump, heater flow valve, or coolant circulation valve; 5. Failure to bleed the system after replacing the coolant. Additional solutions: 1. Check the operation of the blower at each speed setting to ensure sufficient rotation speed; 2. Install or replace the thermostat; 3. Bleed the system if there is an air vent; if ineffective, manually check the two heater hoses for significant temperature differences, then flush the heater core or heat exchanger with water or air pressure; 4. Inspect the filter for dirt or blockage, clean it, and replace if necessary; 5. Bleed the system promptly.
When I was driving, I noticed the heater wasn't blowing hot air, which is usually caused by insufficient coolant or a leak. The antifreeze is responsible for transferring heat to the heater core, and if the level is too low, hot air won't come out. It could also be that the thermostat is stuck, preventing the engine temperature from rising. A clogged heater core is also common, as long-term buildup can block the hot airflow. I experienced this once myself—it was like a fridge inside the car in the middle of winter, and upon checking, there was a small leak in the coolant line. It's quite annoying, so I recommend checking the coolant level every few months and topping it up with antifreeze. If the heater still doesn't work, don't delay—get a full inspection at a repair shop right away.
