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Why Does the Car Heater Suddenly Stop Blowing Air?

1 Answers

AndresLynn

07/29/25 6:44pm

Car heater suddenly stops blowing air due to the following reasons: 1. Blower motor failure; 2. Blower fuse blown or air conditioning system control fuse blown; 3. Blocked air conditioning ducts; 4. Cabin air filter malfunction; 5. Thermostat detection failure; 6. Air conditioning circuit issues; 7. Coolant temperature sensor, thermostat, or water pump circulation damage. The working principle of a car heater involves using the engine's coolant, which flows through a heater core. The blower then forces cold air over the heated core to warm the air, thereby increasing the cabin temperature. A car air conditioning system refers to the climate control device installed in vehicles, capable of cooling, heating, ventilating, and purifying the cabin air. It provides passengers with a comfortable environment, reduces driver fatigue, and enhances driving safety.

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