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you are better off using water from your hose to flush core. disconnect in and outet hoses do not turn hose spicket more then half a turn, apply pressure to both ends and watch how much crap comes out, this procedure has no guarantee that the core wont pop,especially if it is corroded,air is no good because it compresses and is more likely to burst the core if you can use hot water even better just be patient if you start to get circulation you can turn water up a bit, it works 70% percent of the time,make sure you winterize the van when your done

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Q: How much compressed air can you use to blow out a heater core?
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