If I flush my cooling system with a water hose, and I fill my radiator with concentrated antifreeze, will that result in a 50-50 mix of antifreeze and water, once the water in my engine block mixes with the pure coolant in my radiator? I know if I fill my radiator with 50-50, and it mixes with the water in the engine block, mathematically there will have to be more water than antifreeze in my engine cooling mix.
No. You want to flush, then drain the system (petcock on bottom of radiator), then add a 50/50 mix.
Doesn't matter if it's premixed or you mix it yourself from concentrate.
Thanks for your answer. I started with an old truck I just bought. I drained the petcock and filled the radiator with distilled water and prestone flush. Then I drove it a few days, drained and refilled with more distilled water and flush. I’ve done this about three times now, and i’m about to give up on this method and just flush it all out with a water hose until it runs clear. I’m starting to accumulate jugs of dark brown coolant water.
When you get it flushed as good as you can and refill it with a 50/50 mix, either premixed or from concentrate you mixed yourself, drive it for a while so the system has a chance to pump it around for a while
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Then you can use a antifreeze hydrometer to tell you the level of Freeze/Overheat protection you have
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If I flush my cooling system with a water hose, and I fill my radiator with concentrated antifreeze, will that result in a 50-50 mix
This is the way I've always done it, and it seems to work great. I tested with a hydrometer to make sure.
However, I put 50/50 mix into the reservoir tank.
