Why is my C-Class losing coolant without any visible leak?

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Why is my C-Class losing coolant without any visible leak?

If your Mercedes-Benz C-Class engine is overheating and youre constantly refilling coolant without seeing visible leakage, it could be due to a failing head gasket o r internal coolant leak. In Pakistan, extreme heat and poor-quality engine coolants can accelerate gasket wear. A damaged head gasket may allow coolant to enter the combustion chamber, causing the engine to overheat and emit white smoke from the exhaust. This is a serious issue and needs urgent diagnosis and repair.

Talha Kyanii asked on 10 Oct 2025 18:11:22 pm

1 Answer

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Gari Master - on 10 Oct 2025 18:12:14 pm

If youre frequently topping up coolant with no obvious external leak, theres a strong chance of an internal coolant leak, often caused by a blown head gasket. This allows coolant to leak into the engine cylinders and burn off, often causing white exhaust smoke, rough idling, o r overheating. In Pakistan, this problem is worsened by poor-quality coolant o r lack of regular maintenance. A coolant pressure test o r cylinder leak-down test can confirm the issue.