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Added individually, coolant & water won't mix? #5137421
06/18/19 11:15 AM
06/18/19 11:15 AM
Joined: Dec 2014
Posts: 764
California
Ed_Flecko Online content OP
Ed_Flecko  Online Content OP

Joined: Dec 2014
Posts: 764
California
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


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] #5137441
06/18/19 11:28 AM
06/18/19 11:28 AM
Joined: Sep 2008
Posts: 4,198
Southeast Texas
gfh77665 Online content
gfh77665  Online Content

Joined: Sep 2008
Posts: 4,198
Southeast Texas
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
06/18/19 11:29 AM
Joined: Jan 2017
Posts: 3,016
VW Fanboy Island
maxdustington Offline
maxdustington  Offline

Joined: Jan 2017
Posts: 3,016
VW Fanboy Island
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.


03 Jetta AWP/09A 210k kms
Edge 0W40 + Mann 719/30
Re: Added individually, coolant & water won't mix? [Re: Ed_Flecko] #5137464
06/18/19 11:53 AM
06/18/19 11:53 AM
Joined: Apr 2017
Posts: 2,001
Ohio
hallstevenson Offline
hallstevenson  Offline

Joined: Apr 2017
Posts: 2,001
Ohio
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
06/18/19 11:59 AM
Joined: Sep 2015
Posts: 1,934
USA
mk378 Online content
mk378  Online Content

Joined: Sep 2015
Posts: 1,934
USA
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
06/18/19 12:04 PM
Joined: Oct 2011
Posts: 1,676
CA
user52165 Offline
user52165  Offline

Joined: Oct 2011
Posts: 1,676
CA
"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
06/18/19 12:06 PM
Joined: Jan 2017
Posts: 3,016
VW Fanboy Island
maxdustington Offline
maxdustington  Offline

Joined: Jan 2017
Posts: 3,016
VW Fanboy Island
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.


03 Jetta AWP/09A 210k kms
Edge 0W40 + Mann 719/30
Re: Added individually, coolant & water won't mix? [Re: user52165] #5137494
06/18/19 12:30 PM
06/18/19 12:30 PM
Joined: Dec 2014
Posts: 764
California
Ed_Flecko Online content OP
Ed_Flecko  Online Content OP

Joined: Dec 2014
Posts: 764
California
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


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] #5137498
06/18/19 12:37 PM
06/18/19 12:37 PM
Joined: Dec 2011
Posts: 6,337
North Carolina
rooflessVW Online content
rooflessVW  Online Content

Joined: Dec 2011
Posts: 6,337
North Carolina
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
06/18/19 12:42 PM
Joined: Dec 2014
Posts: 764
California
Ed_Flecko Online content OP
Ed_Flecko  Online Content OP

Joined: Dec 2014
Posts: 764
California
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!

https://www.ssdk9.com/
Re: Added individually, coolant & water won't mix? [Re: Ed_Flecko] #5137501
06/18/19 12:42 PM
06/18/19 12:42 PM
Joined: Nov 2006
Posts: 22,007
MA, Mittelfranken.de
Trav Offline
Trav  Offline

Joined: Nov 2006
Posts: 22,007
MA, Mittelfranken.de
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
06/18/19 12:44 PM
Joined: Dec 2014
Posts: 764
California
Ed_Flecko Online content OP
Ed_Flecko  Online Content OP

Joined: Dec 2014
Posts: 764
California
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
06/18/19 01:04 PM
Joined: Jun 2002
Posts: 13,127
The Motor City
Kestas Online content
Global Moderator
Kestas  Online Content
Global Moderator

Joined: Jun 2002
Posts: 13,127
The Motor City
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
06/18/19 01:12 PM
Joined: Apr 2010
Posts: 3,550
Atlanta,GA
BMWTurboDzl Offline
BMWTurboDzl  Offline

Joined: Apr 2010
Posts: 3,550
Atlanta,GA
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.

“It took untold generations to get you where you are. A little gratitude might be in order. If you’re going to insist on bending the world to your way, you better have your reasons.”

435i
Re: Added individually, coolant & water won't mix? [Re: Ed_Flecko] #5137549
06/18/19 01:30 PM
06/18/19 01:30 PM
Joined: Jun 2003
Posts: 19,172
Apple Valley, California
Chris142 Offline
Chris142  Offline

Joined: Jun 2003
Posts: 19,172
Apple Valley, California
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.


02 Wrangler traveler sae30
87 F250 Valvoline 15w40
07 fjcruiser Chevron 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor Chevron sae30
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