What Causes the Smell of Oil When Turning on the Car Heater?

[EllaFitz]

When there is a gasoline smell when turning on the car heater, it is mostly due to an issue with the carbon canister. This occurs when the carbon particles inside become saturated or fail, allowing fuel vapor from the tank to escape into the atmosphere and be drawn into the cabin by the blower. Below is relevant information: 1. Apart from carbon canister issues, external engine exhaust leaks or foreign objects in the air intake can cause unpleasant odors to enter through the air conditioning intake. When using the car heater, it is advisable to alternate between external and recirculation modes. Using the heater in recirculation mode for extended periods can lead to poor air circulation inside the car. If exhaust gases enter the cabin, they can be harmful to health. 2. The car's air conditioning filter should also be cleaned regularly. The filter can trap dust, pollen, soot, abrasive particles, ozone, odors, nitrogen oxides, sulfur dioxide, carbon dioxide, benzene, and other harmful gases, filtering them out through the air conditioning system. Without an air filter, these particles can enter the cabin, not only contaminating the car's air conditioning system but also reducing the performance of the cooling system.