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+--- Tråd: Sweet smell from the vents and coolant keeps vanishing, what's going on? (/showthread.php?tid=111204)
Sweet smell from the vents and coolant keeps vanishing, what's going on? - kirkcole - 2026-11-09
There's a faint sweet smell coming through my air vents when I put the heater on, and the coolant level keeps dropping even though I've never seen a puddle under the car. A mechanic mate reckons it could be the heater core leaking inside the cabin, which sounds expensive and involves half the dashboard coming out. I've been reading about why coolant leaks happen and how to spot them to see if there are other clues I should be looking for, and apparently the sweet smell plus a misty windscreen is a classic sign. Has anyone dealt with a heater core leak before, and did it turn out as expensive as it sounds? Also, is there any risk in just topping up and living with it for a few months, or does it eventually cause bigger problems?