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Ok, I'm getting ready to change my water pump which as obviously failed and I'll change out my thermostat and fan clutch while I'm in there per Mike's recommendations.

Question is, will I get a proper drain of the old coolant while taking the water pump and thermostat off or is there something else I need to do. I know some take the garden hose and flush it out. But, this would be hard water. Is it necessary to flush the system at this point with water or do I install the new parts, fill with new coolant, bleed the system, and call it good?

Thanks,
 

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Drain it as best you can, install the new parts, fill with distilled water, run it for about 2 minutes, turn it off, remove the lower radiator hose, let it drain and repeat again. This will take a good 4 gallons of distilled water.
 
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