Volvo Penta 3.0 GS Overheating

Hey everyone. My name is Chris and I own a 1999 18 foot bowlder with a Volvo Penta 3.0 GS. Last summer the boat ran fine until the end, when I started to notice overheating. This summer the water hose going into the engine ruptured so now I need some help. I've checked the veins on the water pump and their fine. I've ran water through the exhaust manifold and back through the inlet and there was no obstruction of flow. I'm guessing somewhere in the internals there are bits of gunk that are causing all my problems, but I'm no expert. Any advice on back-flushing the engine or should I pursue a different coarse of action. Also the boat needs a thermostat and a new hose (obviously). Thanks for anyones advice.

-Chris

Re: Volvo Penta 3.0 GS Overheating

When you checked that impeller, did the vanes straighten out on their own within 5 to 10 minutes? If not, it needs replaced. If they don't flex fully, you will loose cooling water flow. Rule of thumb is every other year for those impellers.