Mazda 3 gurgling sound and burning smell from engine when accelerating in 4th gear on Mazda 3

Some Mazda 3 owners report experiencing gurgling sounds and burning smells from the engine when accelerating in 4th gear. These issues may stem from air or water circulating in the cooling system, particularly when the engine is hot or shutting down. Additionally, engine overheating can lead to thermo-lock in the cooling system, causing gurgling noises within the radiator or coolant reservoir. Low refrigerant levels in the AC system can also result in a burning smell, similar to that of burning oil, due to compressor failure. Ignoring these burning smells can pose serious risks, including fire hazards, engine failure, or brake malfunctions, highlighting the need for prompt attention to avoid costly repairs. It is advisable for owners to check the cooling system for overheating issues, inspect the AC system for refrigerant leaks, and seek professional assistance to ensure safety and optimal performance.