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Moderator
Join Date: Feb 2004
Location: DFW (Hurst), Texas
Posts: 4,730
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The intent is to have the heater valves open while the cooling system is draining so that the heater core is drain as well. Once you are done draining you can turn the key top to OFF.
Once you get everything opened up you could do the ON and full heat for just 10-20 seconds and all the coolant out of the heater core. If it is just dripping at that point you may even hear the coolant draining into the pan.
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