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Added individually, coolant & water won't mix? #5137421 06/18/19 11:15 AM
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Ed_Flecko Offline OP
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I've heard that the circulation of a car cooling system isn't anywhere near as robust as the lubrication system. Because of this, coupled with the difference in specific gravity of coolant and water, you should always use premixed coolant and water or, at the very least, premix your own before adding the mixture to your cooling system.

I've heard if you add coolant and then water (or vise-versa), the two liquids may never mix thoroughly, due to differing specific gravity and poor circulation, to provide proper cooing, lubrication, protection from corrosion, etc.?

Further, I've heard that by "flushing" your cooling system with tap water, poor system circulation will mean that some of the minerals of the tap water will stay at rest in the system where corrosion (and then problems, etc.) will begin. You're contaminating a delicate system (heater core, etc.) with minerals, etc., that is was never designed to handle.

In short, the closer you keep your cooling system to OEM...the less failures you're likely going to encounter in the future.

Does this sound accurate?

Thank you,
Ed


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Re: Added individually, coolant & water won't mix? [Re: Ed_Flecko] #5137441 06/18/19 11:28 AM
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gfh77665 Offline
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They mix 100%! I have always added the coolant first, then top off with water. Never, never, have they not mixed thoroughly.

I don't power flush, but I have drained out while refilling with a garden hose. My radiators last the life of the vehicles I have owned. No worries.

Re: Added individually, coolant & water won't mix? [Re: Ed_Flecko] #5137443 06/18/19 11:29 AM
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maxdustington Offline
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I've flushed my cooling system with bottles of distilled and I'll never do that again. Next time I'll use a hose T and maybe one last flush with distilled just to try to dilute whatever is in the tap water.


97 GMC RCLB K2500LD L30/4L60
Re: Added individually, coolant & water won't mix? [Re: Ed_Flecko] #5137464 06/18/19 11:53 AM
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hallstevenson Offline
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If they don't mix in the cooling system, why would they mix in a container beforehand ? Stir or agitate them together will do it but the circulation, turbulence, and so on in the cooling system won't ? I don't believe that at all....

Looking at Prestone and Peak websites, they mention nothing about pre-mixing.

Re: Added individually, coolant & water won't mix? [Re: Ed_Flecko] #5137469 06/18/19 11:59 AM
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mk378 Offline
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You can add separately. If you've been flushing with water, just get most of the water out then know the system capacity and put half of that in as concentrated coolant. Then top up with water. Running the engine once until fully warmed up (with the heater on) will ensure complete mixing.

Re: Added individually, coolant & water won't mix? [Re: Ed_Flecko] #5137475 06/18/19 12:04 PM
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"I've heard, I've heard, I've heard" .................................. Where are you hearing this garbage?

Last edited by user52165; 06/18/19 12:06 PM.
Re: Added individually, coolant & water won't mix? [Re: mk378] #5137476 06/18/19 12:06 PM
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maxdustington Offline
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Originally Posted by mk378
You can add separately. If you've been flushing with water, just get most of the water out then know the system capacity and put half of that in as concentrated coolant. Then top up with water. Running the engine once until fully warmed up (with the heater on) will ensure complete mixing.
You would have to know the system capacity, fill it to capacity, then drain it and measure what came out. Then you would mix your concentrate to ratio that would take the remaining water in the system into account.

It's much easier to get an antifreeze tester and a turkey baster/vacuum extractor.


97 GMC RCLB K2500LD L30/4L60
Re: Added individually, coolant & water won't mix? [Re: user52165] #5137494 06/18/19 12:30 PM
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Ed_Flecko Offline OP
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Originally Posted by user52165
"I've heard, I've heard, I've heard" .................................. Where are you hearing this garbage?


I was listening to a podcast, but here's the conversation in print: https://bit.ly/2IMQ3UD

Ed


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Re: Added individually, coolant & water won't mix? [Re: Ed_Flecko] #5137498 06/18/19 12:37 PM
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Coolant and water mix just fine in the system.

How do I know? I filled my car with 3 gallons of coolant then topped it off with 3 gallons of water.

If ever there was a cooling system where water and coolant wouldn't mix, its mine. The liquid in my coolant bottle went from clear to pink within minutes of starting the car.



"Zed's dead baby, Zed's dead."
Re: Added individually, coolant & water won't mix? [Re: rooflessVW] #5137500 06/18/19 12:42 PM
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Ed_Flecko Offline OP
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Originally Posted by rooflessVW
Coolant and water mix just fine in the system.

How do I know? I filled my car with 3 gallons of coolant then topped it off with 3 gallons of water.

If ever there was a cooling system where water and coolant wouldn't mix, its mine. The liquid in my coolant bottle went from clear to pink within minutes of starting the car.



Thank you...that's good to hear that you have "first-hand" experience with this issue!

smile

Ed


K-9s teach the suspect that if you run...you'll only be arrested tired.

Support YOUR local law enforcement K-9 Unit!

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Re: Added individually, coolant & water won't mix? [Re: Ed_Flecko] #5137501 06/18/19 12:42 PM
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Trav Offline
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If you flushed the cooling system with water and water is still in the block filling with undiluted anti freeze will push the water out of an open hose or port without mixing to a degree you could see it.
Once you see antifreeze/coolant, reconnect the hose you had removed and continue to fill with 50/50 (you do end up with a slightly stronger mix then a weaker one). Once the engine is running it mixes completely.


ASE L1, Master. Deutsch Meisterbrief.
Re: Added individually, coolant & water won't mix? [Re: Trav] #5137503 06/18/19 12:44 PM
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Originally Posted by Trav
If you flushed the cooling system with water and water is still in the block filling with undiluted anti freeze will push the water out of an open hose or port without mixing to a degree you could see it.
Once you see antifreeze/coolant, reconnect the hose you had removed and continue to fill with 50/50 (you do end up with a slightly stronger mix then a weaker one). Once the engine is running it mixes completely.


Thank you Trav!

smile

Ed


K-9s teach the suspect that if you run...you'll only be arrested tired.

Support YOUR local law enforcement K-9 Unit!

https://www.ssdk9.com/
Re: Added individually, coolant & water won't mix? [Re: Ed_Flecko] #5137524 06/18/19 01:04 PM
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Kestas Offline
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It's like saying vodka and cranberry juice won't mix.

Antifreeze is an alcohol, not a mineral oil lubricant.

Re: Added individually, coolant & water won't mix? [Re: Ed_Flecko] #5137532 06/18/19 01:12 PM
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Ethylene glycol (antifreeze) has a density of 1.11 g/ cm 3

Water is 1.0 g/ cm 3

Last edited by BMWTurboDzl; 06/18/19 01:12 PM.

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Re: Added individually, coolant & water won't mix? [Re: Ed_Flecko] #5137549 06/18/19 01:30 PM
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Whoever told you that they won't mix was wrong. As soon as the water pump starts spinning it begins to mix and completely mixes when the thermostat opens.


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