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gran

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"I'm loosing coolant throu

"I'm loosing coolant through the overflow on my 225 Chrysler Marine. It has a heat-exhanger.
Tested cooling sytem for broken gasket leaks, it is ok. Need to replace radiator cap, but can't decipher letters or numbers on old cap.
What is the recomended pressure for the new cap?"
 
"The thermostat housing is the

"The thermostat housing is the highest point on the engine. So it can get air in it. With air around the thermostat it doesn't open properly. The engine can run at low rpm on just the bypass flow and once you give it the go, it overheats. Now the boiling coolant vapor locks the pump.
How does air get into the system? I have a theory on that too. You fill the system. It runs great. As The engine heats up, the coolant expands, the excess spills out the overflow spout. Now when the engine cools off it sucks air back in through the overflow spout.
Solution: mount a cheap overflow tank near the engine when the engine heats up the overflow is caputed, when the engine cools off coolant rather than air goes back in the overflow spout.
Air stays out, engine cools properly.
Worked for me."
 
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