Posted on 9/26/2025

When something smells off inside or around your vehicle, it’s often a sign that something mechanical isn’t right. Some odors are harmless, but others can warn you about issues that need immediate attention. Ignoring these warning signs can lead to safety hazards or expensive repairs later on. Here are six unusual smells that may suggest something is going wrong under the hood or beneath the cabin. 1. Sweet Syrup Smell Could Mean a Coolant Leak If you notice a sugary, sweet scent, especially after driving or when the engine is hot, it could be a coolant leak. Antifreeze has a distinct sweet smell, and leaks may come from the radiator, a hose, or even inside the cabin if the heater core is cracked. A coolant leak not only risks overheating your engine but can also be dangerous to pets or children if the fluid ends up on the ground. Check for wet spots under the front of your car or foggy windows inside that persist even when the defroster is on. ... read more