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for the 4.7 the capacity is stated to be 14.5 qts. Is that the total capacity or just the draining of the radiator. I'm trying to find out how many gallons do I need to buy when I'm just doing a simple drain and refill?
 

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Cooling System*
4.7 Liter Engine. U.S. 14.5 QTS
*Includes heater and coolant recovery bottle filled to Max level.

2007 owners manual page 402
 

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To me its worth totally draining the system, get all fresh fluid inside the cooling system. If you only drain the radiator, then make sure to change the coolant again much sooner than the recommended max life, because you've diluted the protectant agents with the old fluid where the protectant agents were depleted.

At least pull the lower radiator hose, that is often good to get another good couple of quarts out of the system. Pulling the water jacket drains help as well, BUT, some of the new engines are designed to NOT trap water, if you pull the radiator hose all the fluid will drain from the motor, DON'T know if that is true for any of the Commander Engines, its true for mini-van 3.3L V6.

Disconnecting a heater hose and forcing compressed air down it will clear out the heater cores.

I purchase several gallons of "Distilled Water" from the Grocery Store and use that to mix with the anti-freeze. Distilled Water is pretty much purified water and it has all the disolved minerals removed from it. Those disolved minerals are what come out of solution and form scale in your cooling system if you use tap water to mix with the anti-freeze.

Don't forget, the aftermarket equalevalent of Chrysler H.O.A.T. antif-freeze is Zerex G-05.
 
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