Why is the car air conditioner not heating?

2 Answers
ThomasRose
09/01/25 2:36am
The reasons why the car air conditioner is not heating are: 1. Insufficient coolant; 2. Damaged water pump; 3. Clogged heater core; 4. Faulty radiator fan. The maintenance methods for the air conditioner are: 1. Regularly clean the surfaces of the condenser and evaporator; 2. Pay attention to the operation of the compressor; 3. Close the external circulation when there is a lot of dust in the air to reduce pollution to the air filter; 4. Regularly clean the air ducts and replace the air filter to keep the air inside the car fresh. The car air conditioner adjusts and controls the temperature, humidity, air cleanliness, and air flow in the car compartment to an optimal state, providing a comfortable environment for passengers and creating good working conditions for the driver. It is an important ventilation device for ensuring safe driving.
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DominicRose
09/13/25 5:32am
Last time my car's AC cooling was okay, but the heating didn't work at all. After inspection, I found it was a coolant issue. The heating relies on the engine's hot water circulation. If the coolant is insufficient or the thermostat is stuck, hot water simply can't flow into the heater core. Also, if the heater core itself is clogged, it's useless, just like a thermos that can't pour water when blocked. By the way, if the blend door actuator goes crazy and the hot air duct can't open, that's also a big problem. The worst is when the heater core leaks, making the area under the dashboard all wet. If you feel one hot and one cold pipe behind the glove box, there's a 90% chance the core is clogged. This needs to be fixed ASAP—driving in winter with freezing hands and feet plus fogged-up windows is dangerous!
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