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There's a plug at the bottom of the radiator... usually on the passenger side. You unscrew it, and you can run a garden hose into your radiator fill to flush out the remaining coolant.. you do this while the vehicle is running, so that the thermostat will open up and cycle coolant (and the water you're flushing it out with) through the system.

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Q: How do you drain the coolant on 2003 escalade?
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