How to winterize a closed loop cooling system??

cbaden · Newbie Joined: 10 May 2006 Posts: 5

I have a 1999 SAN and it has a factory closed loop cooling system on the GT-40 engine. Have winterized I/O's for manny years so I know what it takes to winterize a boat just need a little help with the closed loop system.

pet575 · Posted: Oct 09, 2008 11:48 am Post subject:

I still do the winterize the I/O routine, but it is my understanding that a closed cooling system does not require much winterization because the coolant in the closed system is antifreeze rather than water.

Broccoli B · Posted: Oct 10, 2008 6:48 am Post subject:

There is still a raw water exchanger that cools the antifreeze that needs to be winterized.