Why is the car AC blowing hot air?
2 Answers
The reasons for a car AC blowing hot air include: insufficient refrigerant in the car AC, leaks in the AC system, poor heat dissipation in the AC cooling system, clogged AC filters, compressor malfunctions, etc. Here are some car AC maintenance tips: 1. Avoid using AC immediately under strong sunlight: In summer, parked cars can get very hot inside. After starting the vehicle, don't turn on the AC right away. Instead, open all windows to ventilate and let the hot air out. Once the interior temperature drops, close the windows and turn on the AC. 2. Alternate between recirculation and fresh air modes: Many car owners are unsure about when to use the recirculation or fresh air mode in their car AC. When a car has been parked in the sun for a long time, the interior temperature can be higher than outside. Turning on the recirculation mode immediately upon entering the car won't be effective. Instead, open the windows for ventilation and use the fresh air mode to expel the hot air. Once the interior temperature drops, switch to recirculation mode for better cooling. However, prolonged use of recirculation can make the air inside stale, so it's important to alternate between recirculation and fresh air modes. 3. Occasionally use the highest fan speed: Frequent use of the AC in summer can accumulate dust. Occasionally setting the fan to its highest speed helps blow out residual dust in the air ducts. To maintain fresh air inside the car, clean the AC filter regularly.
Last year while driving, my car's AC mode unexpectedly blew hot air, which was quite uncomfortable. After checking for a long time, I found it might be due to insufficient refrigerant - this stuff is like the 'coolant blood' of a car. When it leaks, the compressor can't work properly and ends up blowing hot air instead. It could also be a faulty temperature control switch on the panel, or the blend door stuck in the heating position. Other common issues include damaged compressor clutch, blocked pipelines, or condenser fan failure leading to poor heat dissipation. A simple fix is to restart the system or check if the AC button is truly activated; if that doesn't work, immediately pull over to a safe spot and head to a repair shop. Getting AC maintenance before summer can prevent this issue, avoiding distracted driving accidents. Malfunctioning hot/cold mode switching also affects comfort - don't overlook electrical problems like blown fuses. In short, address issues promptly to prevent compressor failure and unnecessary expenses.
