Here's the link to the entire article:
http://www.agcoauto.com/content/news/p2_articleid/75

Extract:
"The coolant and distilled water must also be premixed, before pouring into the radiator. Because coolant is much heavier than water, it may settle to the bottom of the engine. Water that is added after the coolant will not mix. This vastly disturbs the corrosion protection and can cause hot-spots in the engine. Pre-mixed coolant is very good for this purpose, though it is considerably more expensive."

I have never seen this comment before.
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Post Back. That's whats makes this forum work.

They must have planned on not running the engine! I'd think with several trips through the
cooling system (especially a Volvo system) it would be VERY well mixed, especially if
the heater is in the circuit.

Having said that, I worked in the plastics industry for a while and they had density
colums that they made up with water and various alcohols which they mixed as they
poured, so they had a density gradient from the bottom to the top. They calibrated
them with glass balls of known density which they dropped into the columns.
(The columns were transparent glass tubes about 2½" in diameter)
For high density polyethylene they were most concerned with densities of 0.94 to 0.96
and they had that spread out over a height of about 4 or 5 inches so they could see small
differences in density. They would cut a small piece of plastic into a specific shape
(so they could tell which was which) and carefully place it in the column.
It would sink to where the liquid was exactly the same density as the plastic.
Since they had calibrated their charts on the exact heights of the calibration balls,
they could quickly read the density from the height off their charts.
When the column got so many samples in it that it was confusing they had a strainer
basket that sat in the bottom of the column and they would slowly lift it all out,
then put the calibration balls back in. As long as they were careful the column would
stay at its density gradient through several cleanings. Then it would slowly
recalibrate itself toward the middle of range from both ends

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George Downs Bartlesville, Oklahoma

About 25 years ago, I cared for a '54 Ford for my buddy during the winter.

He called me and advised me that the car had no antifreeze and it was getting cold.

I could not get the radiator drain open and did not want to take the bottom hose off.

I took a turkey baster and removed as much water as I could - the top of the radiator was pretty big.

I poured antifreeze in slowly until the radiator was full again, and removed the water again - it had almost no color.

I did this process one more time and had added enough antifreeze to do the job.

I then ran the car to mix things up.

I do not think that antifreeze remains separated after the motor is run up to temperature.
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'96 855R,'64 PV544 driver, '67 P1800 basket case, '72 Yamaha Rd400, '68 Honda 350-4, '12 XC70, the first 5 are mine, heh, heh, 525,000 miles put on 10 bricks James A Sousa

Coolant and distilled/demineralized water posses unique densities, or specific gravities, like your fave ale or dry Irish stout (yet don't be drinking no antifreeze or coolant mix, k?).

Thermal-induced currents, the water pump transfer volumes, and mostly so the solubility between antifreeze and distilled/demineralized water facilitates a coolant mix after sometime in the water jacket. (Don't ask me for proof rigging up my camera or testing equipment to a hot B30 E engine.)

That stated, I pour both antifreeze and distilled/demineralized water into the coolant expansion tank simultaneously; yet the antifreeze container empties before the water empties from the distilled/demineralized water containing container so the outcome is the correct mix.

Remember folks, do not ever use tapwater when mixing with antifreeze to make coolant.

Hope that helps.

Buttermilk and Corn Chips for Dinner Guy.
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Dood, you said, "buttermilk."

I dont see that happening. In my mind its like putting something in a blender.
sounds like a crock. Many times Ive put in one, and then the other. As well as blending them first, with no ill effect either way. Somebodies blowing smoke.

Larue

I would think that a trip or two through the water pump and radiator would mix the water and antifreeze pretty throughly. I have never seen the water sit at the top of the radiator or had it freeze.

When I was filling the radient heat system in my greenhouse I left a garden hose hooked up to the inlet. The idea was to pressurize the system while I bled the air bubbles out. There were several feet of antifreeze colored water in the hose when I disconnected it. That was all through diffusion.

Greg

antifreeze/coolant is interesting stuff, have you ever had to check it for conductivity?