Smoke Coming from Under Hood

Seeing smoke billow from under your hood is scary. Take a breath — most of the time it's a manageable leak, not a catastrophe.

Smoke from under the hood is almost always a fluid — oil, coolant, or power steering fluid — that's found its way onto a hot surface like the exhaust manifold or engine block. Oil produces a darker smoke with an unmistakable burnt-oil smell. Coolant creates white steam with a sweet, almost syrupy odor. Power steering fluid smells similar to burnt oil. In each case, the fluid is boiling and vaporizing on contact with a surface that can exceed 400°F at the exhaust manifold.

Pull over, shut the engine off, and let it cool for 10-15 minutes before opening the hood. Look for the source — follow the wet trail upward from where it's hitting the hot surface. Common leak points are valve cover gaskets (oil runs down onto the manifold), radiator hoses (coolant sprays from a failed clamp), heater hoses, and power steering line fittings. If the smoke was brief and has stopped, the leak may be small and intermittent. If it's still actively producing steam or smoke after shutdown, the leak is significant.

A mobile mechanic in Jacksonville, FL is the smart call when your car is smoking under the hood. You don't want to drive a leaking, smoking vehicle — you want someone to come to you. We'll find the leak, assess the damage, and do the repair right where you are. Hoses, gaskets, clamps — we carry common parts and can handle most of these same-day. Call (904) 788-7272.