What are the reasons why a car doesn't blow warm air?
3 Answers
The reasons why a car doesn't blow warm air are: 1. Dirty air filter; 2. Thermostat is always open or opens too early; 3. Damaged or slipping water pump impeller; 4. Air lock in the engine cooling system. The functions of car air conditioning: 1. Achieve cooling effect through continuous phase change cycle of refrigerant; 2. Remove dust, odors, smoke, and toxic gases from the air inside the car, making the air fresher, and humidify the air inside the car. The maintenance methods for car air conditioning are: 1. Do not set the temperature too low; 2. Control the direction of the air outlet; 3. Do not use it for a long time; 4. Appropriately turn on high air volume; 5. Turn off the air conditioning when driving at low speed.
I often check car issues myself. If the heater isn't working, there could be multiple reasons. It might be low on coolant - if the level is too low or the pump fails, it can't draw heat to warm the air. The heater core could also be clogged; dust buildup during summer affects heat dissipation, resulting in cold air in winter. If the fan gets stuck or stops spinning, there'll be weak or no airflow. Temperature control switches may malfunction too, like faulty knob contacts. These issues are more common in older cars. Last time, my neighbor's car had heater core leakage causing dangerous windshield fogging while driving. I recommend first checking coolant level with engine off, testing if the fan operates, and consulting a professional for core component inspection if needed.
Last winter, I took my family out for a drive, but the car couldn't produce any warm air, leaving us shivering. The issue was later traced to a stuck coolant circulation pump, which prevented heat from reaching the heater. It could also have been due to a rusted and clogged heater core, blocking airflow when the pipes were obstructed. The fan bearings squeaked but didn't turn, and the motor's wiring had aged and broken. Additionally, the cabin air filter was completely clogged, and not replacing it in time affected airflow. The mechanic mentioned these issues are more common in cold northern climates and advised checking the coolant's freezing point and topping it up regularly. After that incident, I developed a habit of checking the fan speed and fluid levels before winter to avoid any travel mishaps.
