Coolant Resevoir Keeps Filling Up.

[bigpursuit]

Like I said.....it is hard to get facts that don't change over the web.

It is possible that a bad seal on the suction side of the water pump could have an issue. When they do, they usually leak antifreeze when you pressurize them or switch a hot engine off. This is really not a hard problem to trace. Changing a few hoses will show where the air is coming from. The air is a symptom not the systemic problem. If you check the hose that feeds the manifold that eventually gets hot....my bet is that you will find air heading into the manifold which is why it gets hot.

You and your mechanic need to deal with this before you replace the water pump. The water pump is an educated guess. The clear hoses will tell you where the air is coming from.

-John

Thanks John! I really appreciate the input. My mechanic is coming out next week to do the clear hose thing and replace the pump. I decided to go ahead and replace the pump then do the clear hose test if the pump doesn't fix the problem. I agree it is an educated guess and may be a waste of money for the pump. The boat is 12 years old and the pump is not very expensive. I will post on here the result one way or the other.

 

[bigpursuit]

The boat is fixed! i replaced the coolant circulating pump(water pump) and all is well. I wrote an email to the manufacturer of the pump to ask if it was possible the pump was sucking air without leaking and they responded it was absolutely possible. So it appears that was my problem.

 

[PlayDate]

Congrats. Good work.

-John

 

[Air O'Nautical]

Thanks for the update.
Never knew that could do that.
I learned something through your problem...Thanks!

 

[Bwardz50]

Interesting read, 6 years later.