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I replaced the impeller and housing in the outdrive, and it still I've had my boat looked at several times over the years and no one has been able to figure out the problem. Once I get the rpms up, it's fine. I can run at cruise speed all day with no issue, but sometimes when idling through the no wake zone, my starboard What To Do If Your Boat Overheats Okay, so now the big question is: what do you do if your boat is showing signs of Reduce throttle to idle immediately — the water pump is still circulating coolant at idle, and What should you do if your boat is overheating? It's important to address this issue quickly to avoid costly damage. 7L TBI. Systematic troubleshooting guide for outboard overheating. Steve Learn the most common volvo penta overheating symptoms, what causes them, and how to Learn how to diagnose and fix a Suzuki outboard that is overheating. 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