Winterizing Closed Loop Colling System

[stevelaudwig]

I have a Formula with twin 5.0 Merc's with closed loop colling. I've never winterized a closed loop system before. What plugs do I need to pull to drain the fresh water without draining the anit-freeze in the block?

 

[Haut Medoc]

Re: Winterizing Closed Loop Colling System

Depends on the year & type of your set up......
Are your manifolds part of your closed system or not?.......
Generally, draining the risers (poke the holes with an awl to make sure they are not clogged with scale)& the lowest part of the intake side is sufficient.....
This is usually at the power steering cooler, if you have them......