After buying the Chevrolet Cobalt sedan, a hood seal was installed to protect the engine bay from weather and road debris. Yet a long rain-soaked drive revealed that the seal alone isn’t enough to keep the hood core dry. Water can still find its way into vulnerable gaps, and over time that moisture can affect electrical components and engine performance.
Between the bumper and the radiator sits a diffuser that guides the airstream as the vehicle moves. In some driving conditions, the diffuser doesn’t extend all the way to the radiator area, causing a portion of the air to rise and curl upward. That upward flow can push moisture and warm air toward the engine compartment, reducing cooling efficiency and inviting condensation in places it doesn’t belong. The result is a hood area that isn’t as clean or dry as it could be, especially after heavy rain or frequent gusty winds.
To address the issue, a thin strip of plastic was installed to close the small gap. This simple modification helps redirect airflow more effectively and minimizes the amount of moisture that can reach the engine bay. The result is a cleaner under-hood environment with reduced splash and better protection for components during wet conditions.
In practice, these kinds of tweaks demonstrate how minor aerodynamic improvements can translate into tangible benefits for everyday driving. Small adjustments to the diffuser can influence heat management and reduce the buildup of oily or damp areas under the hood, contributing to a more reliable and efficient engine bay overall.
The prize for the author of the advice is the OSRAM ONYX COPILOT navigation lamp.
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