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well if your always running low on coolant then check the radiator for any cracks or leaks. sometimes these drain plugs like to leak. park your car one night and put some cardboard under it and check it in the morining to see where all the leaks are coming from. that tube looks like just a drain tube it could be that the heater core is failing just keep an eye on it and when your heater stops working replace your heatercore.
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