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Unread 08-26-2015, 02:27 PM   #1
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Default Will this coolant flush method work?

Many people replace their car's coolant simply by draining the radiator's coolant but this method is incomplete because coolant remains in the engine block and heater core. (Starting and stopping the engine and simply repeating the process several times will not drain ALL the previous coolant because you are mixing it with the new coolant.)

Will this more complicated method remove ALL the coolant in the entire system? Any thoughts? Improvements?

1. Drain the radiator parts: Remove the radiator's bottom tap. Close the tap.
2. Drain/refill the engine block: Use an ebay €15 manual water pump and connect it to both heater core hoses and pump distilled water.
3. Drain/refill the heater core: Connect manual water pump to heater core intake and outtake connectors and pump distilled water.
4. Refill the radiator: Fill the reservoir.
5. ALL of the cooling system should now be filled with distilled water.
6. Reconnect manual water pump to both heater core hoses. Pump concentrated antifreeze to get 50% mix (this will pump 50% of the distilled water out of the cooling system).
7. Start engine and add antifreeze or distilled water if necessary.

Last edited by jonapom; 08-26-2015 at 02:30 PM.

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Unread 08-27-2015, 11:53 AM   #2
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The only reason to "flush" out your cooling system is to remove the spent glycol and replace it to maintain the anti freeze characteristics. If you have a buildup in the system, simply draining it, filling with water and a cleaning solution, running it for a week, drain and refill with new glycol mix is plenty.
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