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Closed Cooling System - Mercury OEM Parts - iboats.com
Closed cooling system
![Closed Cooling System - Mercury OEM Parts - iboats.com](https://i2.wp.com/ww2.iboats.com/mall/image/view/1/6/common2140_1.gif)
![Mercruiser 3.0 Cooling System Diagram](https://i2.wp.com/schematron.org/image/mercruiser-30-cooling-system-diagram-3.png)