What Causes a Burning Smell When the Car Air Conditioner is On?
2 Answers
If there is a burning smell inside the car after turning on the air conditioner, it may be due to mold growth on the surface of the heat exchanger fins, which emits a musty odor (similar to traditional medicine or a burnt smell). The musty smell occurs because moisture and mold accumulate on the indoor heat exchanger of the air conditioner and cannot fully evaporate, forming mold spots that produce the odor when the system is turned on after a long time. Here are some simple solutions: 1. Change the current usage habits: Mold on the heat exchanger is often related to usage. Since condensation easily occurs during cooling, it is important to ensure proper ventilation after turning off the system to maintain smooth heat dissipation. 2. It is recommended to remove the air conditioner filter and gently brush the internal fins with a soft brush and detergent to remove surface mold. 3. Purchase specialized air conditioner cleaning solutions designed to eliminate mold for treatment. 4. Frequently run the air conditioner in ventilation mode to keep the heat exchanger dry.
Recently, I encountered a similar issue while driving. When I turned on the AC, there was a strong burnt smell, which was particularly pungent and quite concerning. This is usually caused by a problem with the AC system, such as a clogged air filter filled with dust and debris, which restricts airflow and causes the compressor to overheat, burning the dirt on the filter. Another possibility is an electrical short circuit, like aged wiring or loose connections, leading to unstable current and overheating, which produces smoke. It could also be that something is stuck in the AC ducts, like burnt fur from a dead rodent, which is especially foul-smelling and harmful to health. I recommend turning off the AC immediately, opening the windows for ventilation, and pulling over to inspect the issue. If the smell persists, don’t risk driving further—head straight to a professional auto repair shop for inspection. Safety comes first, and this could also prevent bigger losses, such as fire hazards.
