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2015 Malibu 23 LSV w Monsoon 350- heater winterize


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10 hours ago, granddaddy55 said:

typically return on manifold near tstat housing with return into water pump housing

And very likely the only 5/8" hoses on the boat.

You should only need to pull one hose and blow in it.  The one on the intake manifold is probably the easiest to reach.  I would resist the urge to just blast it with compressed air.  Push the slug of water out with high volume, low pressure air so you don't blow the core.  Your lungs are a great choice.  

Is it not possible to reach up under the dash and disconnect the lower hose on the core itself?

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6 hours ago, justgary said:

And very likely the only 5/8" hoses on the boat.

You should only need to pull one hose and blow in it.  The one on the intake manifold is probably the easiest to reach.  I would resist the urge to just blast it with compressed air.  Push the slug of water out with high volume, low pressure air so you don't blow the core.  Your lungs are a great choice.  

I just winterized my 2008 this weekend and as @justgary says the hose on the top of the manifold is the easiest to reach but it might be under the intake plenum. Since I still had my hose disconnected from the outlet side of the sea water pump, the water just flowed out that hose. I tried blowing in the hose but did not have much success so I reversed my 1.5 gallon shop vac and was able to push all the water out and then clean it up.

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