antifreeze (coolent) change

[woldson]

Having to dilute (flush) out old coolent.

This will leave me with fresh water in the block.

Can anyone estimate the amount of water in the block after just draining the radiator? (I know it will partially drain the block/head as well.)

I know this is mundane question but I do not have a coolent checker.

[gwnwar]

Id just use the premixed stuff and not worry about it.. Cool checkers are only a couple of bucks at the auto store.. If you pull your lower hose of there won't be enough to worry about left in the engine..

[woldson]

I guessed, getting one tomorrow. I will post how good or poor my guess was.

[Tony D]

They give you total system capacity in the FSM.

 

Make a 50% mix, you put half the amount required of antifreeze. Anything left over, you top off with fresh water.

 

60/40 Water Glycol? 40% of the total amount of glycol, and top off the rest with water.

 

Incidentally, you really should mix externally and fill with your mix instead of trying to have the pump 'mix' it for you.

[woldson]

For what it is worth:

1 and a 1/4 gallon of prestone dex cool 5yr. 150k antifreeze.

This was added after a warm drain of the radiator. Some was premixed while the rest was just added straight coolant. (Then drove it around, and reved it to open thermostat and mix as well as I could.)

 

Measured with a prestone coolant tool and it will give you approx. -37F protection.

 

This is a 50/50 mix, recommended by prestone.

 

Boring, but there it is.