Engine cooling system - What is this?

I

islandrunner70

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Sep 1, 2011
21
Beneteau Oceanis 370 TBM
Hey everyone,

The item in the pics is installed between the heat exchanger and the hot water tank.

Is this something I can use to change the coolant? If so what tools do i need to connect to this plug.

There is a pic with the cap on and one with the cap off.

Thanks
 

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woodster

woodster

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Sep 15, 2009
6,243
S2 9.2a Fairhope Al
looks like a schrader valve for maybe bleeding the air out of the system
 
Bill Roosa

Bill Roosa

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Jun 6, 2006
6,990
currently boatless wishing Harrington Harbor North, MD
Well it is a schrader valve but you would never use it to bleed the air out of the system.
I'm thinking that a PO installed it so you can blow the raw out of the system during decommissioning using compressed air.
You say it is between the heat exchanger and HOT WATER TANK????? One has raw water the other antifreeze. With a 37 I'm not thinking you have raw water cooling so .......
 
I

islandrunner70

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Sep 1, 2011
21
Beneteau Oceanis 370 TBM
Thanks for the responses. Yes this valve is installed between the heat exchanger (located on the enginer) and then it runs to the hotwater tank. This line contains the coolant. My boat has a Volvo Pento 2003 model.

I was hoping it would make flushing/changing the coolant easier.
 
joker460

joker460

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Apr 27, 2010
968
Beneteau 352 Hull #276 Ontario
I have this as well and it was Beneteau Installed in the same location as yours. I was told it was to bleed the air out of the system.
 
BigEasy

BigEasy

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Jun 21, 2004
2,903
Beneteau 343 Slidell, LA
I have the same fitting on an '06 Beneteau with a 3YM30 Yanmar. I also thought it was to bleed air out of the cooling system. Planning to change the coolant / flush the system in a few weeks. Will find out then.
 
kloudie1

kloudie1

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Nov 6, 2006
10,095
Hunter 34 Mandeville Louisiana
Could be an air bleed, to get air out of the coolant lines going to the water heater.. Ya sure would NOT want to do that with the engine hot ! .. could also be used (carefully) with an air compressor to blow all coolant out of the water heater when changing coolant..
 
BigEasy

BigEasy

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Jun 21, 2004
2,903
Beneteau 343 Slidell, LA
Thanks Kloudie, that's a good idea. I have a portable "pancake" type compressor. I might give it a try to completely empty the system when I change coolant.
 
srhummer

srhummer

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Mar 25, 2010
152
Hunter 34 Rose Haven MD
Not sure why you would blow out the coolant and leave the system dry - I understood the antifreeze acts as a rust/fouling inhibitor and is able to go lower than the pink stuff. After all, I don't know anyone that drains the antifreeze form the engine for winter.
I do blow out my fresh water system so that it can not freeze (don't like the pink stuff) but have always left the coolant side as is for the winter.
 
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