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#3332221 - 04/03/14 11:56 AM What's the best way of getting proper coolant mix?
Gokhan Offline


Registered: 12/29/10
Posts: 1733
Loc: Los Angeles, California
I'll do a distilled-water flush. I have a separate radiator cock and engine-block cock, and I'll drain both. Specified system capacity is 6.6 qt per the OEM repair manual.

Do I just assume that this is the correct capacity and use 3.3 qt of concentrated antifreeze and top off the rest with distilled water to get the optimal 50/50 mix? Should I put a little more than 3.3 qt just in case? Heavy-duty heater core could result in a higher system capacity and the repair manual might not have taken into account a generously filled overflow reservoir. Of course, the overflow reservoir needs to be filled with the 50/50 mix separately as it won't mix easily by itself and I need to include the amount of the antifreeze put in there in the calculations.

Any tips are appreciated.
_________________________
1985 Toyota Corolla LE, 4A-LC engine, ~ 259,000 M
Toyota (by ExxonMobil) SN/GF-5 0W-20 Synthetic
Toyota 90915-YZZF2 filter, 90430-12031 drain gasket

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#3332229 - 04/03/14 12:00 PM Re: What's the best way of getting proper coolant mix? [Re: Gokhan]
ABerns Offline


Registered: 08/11/10
Posts: 422
Loc: Iowa
If it were me, I'd put in 3.3qt of antifreeze, then top off with water (as you suggested).

I don't think it gets that cold where you are to worry about it, but you can always later test your anti-freeze to see its freezing point. If too low, just add a bit more anti-freeze.

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#3332231 - 04/03/14 12:02 PM Re: What's the best way of getting proper coolant mix? [Re: Gokhan]
dparm Offline


Registered: 04/19/10
Posts: 12612
Loc: Chicago, IL
Getting exactly 50/50 is not a big deal. You can safely run 60/40. Seeing as how you're in LA, you'll never know the difference.
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#3332249 - 04/03/14 12:19 PM Re: What's the best way of getting proper coolant mix? [Re: Gokhan]
datech Offline


Registered: 01/14/14
Posts: 659
Loc: us
I guess you measure how much you drain out and somehow calculate the amount.

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#3332257 - 04/03/14 12:23 PM Re: What's the best way of getting proper coolant mix? [Re: Gokhan]
Gokhan Offline


Registered: 12/29/10
Posts: 1733
Loc: Los Angeles, California
Of course, I am not worried about freeze protection at all in LA, where it went down to 30 F only once in the last 20 years.

I am worried that (1) if I put less than 50% antifreeze, corrosion inhibition will be compromised, as the corrosion inhibitors will be too dilute, and (2) if I put more than 50% antifreeze, cooling efficiency will be compromised, as antifreeze is not as efficient as water in transferring heat. (3) In addition, antifreeze has very low viscosity and a very high concentration could result in leaks and coolant consumption.
_________________________
1985 Toyota Corolla LE, 4A-LC engine, ~ 259,000 M
Toyota (by ExxonMobil) SN/GF-5 0W-20 Synthetic
Toyota 90915-YZZF2 filter, 90430-12031 drain gasket

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#3332284 - 04/03/14 12:45 PM Re: What's the best way of getting proper coolant mix? [Re: Gokhan]
dparm Offline


Registered: 04/19/10
Posts: 12612
Loc: Chicago, IL
Like I said, being off by a bit isn't going to be a big deal. Pour in the 3.3 quarts and fill the rest with water.
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2011.5 BMW M3 saloon ZCP
der stärkste buchstabe der welt
Castrol Edge Professional TWS 10w60 + Mahle OX 254D3

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#3332289 - 04/03/14 12:49 PM Re: What's the best way of getting proper coolant mix? [Re: Gokhan]
mrsilv04 Offline


Registered: 12/08/06
Posts: 6847
Loc: Illinois
Originally Posted By: Gokhan
Of course, I am not worried about freeze protection at all in LA, where it went down to 30 F only once in the last 20 years.

I am worried that (1) if I put less than 50% antifreeze, corrosion inhibition will be compromised, as the corrosion inhibitors will be too dilute, and (2) if I put more than 50% antifreeze, cooling efficiency will be compromised, as antifreeze is not as efficient as water in transferring heat. (3) In addition, antifreeze has very low viscosity and a very high concentration could result in leaks and coolant consumption.


A higher concentration of coolant has a higher boiling point... better than lower. Not sure where you got the opposite.

Dump in 4 quarts of coolant, and top off with water. You'll be fine. You're over-analyzing this big time.


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#3332307 - 04/03/14 01:11 PM Re: What's the best way of getting proper coolant mix? [Re: mrsilv04]
Gokhan Offline


Registered: 12/29/10
Posts: 1733
Loc: Los Angeles, California
Originally Posted By: mrsilv04
A higher concentration of coolant has a higher boiling point... better than lower. Not sure where you got the opposite.

Of course, it has a higher boiling point and lower freezing point.

I am talking about the cooling efficiency -- how much a coolant can extract heat from the engine. Water is more efficient than antifreeze in extracting heat; so, in principle, your engine would run cooler with 100% distilled water than with an antifreeze mix. Of course, there would be little corrosion protection.
_________________________
1985 Toyota Corolla LE, 4A-LC engine, ~ 259,000 M
Toyota (by ExxonMobil) SN/GF-5 0W-20 Synthetic
Toyota 90915-YZZF2 filter, 90430-12031 drain gasket

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#3332380 - 04/03/14 02:22 PM Re: What's the best way of getting proper coolant mix? [Re: Gokhan]
sayjac Offline


Registered: 10/13/08
Posts: 8794
Loc: The Old North State
~3.3 qts. AF in system, top with distilled to full. Make a 50/50 mix AF/distilled for or in recovery tank. Good to go. Close enough.

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#3332383 - 04/03/14 02:26 PM Re: What's the best way of getting proper coolant mix? [Re: Gokhan]
jrustles Offline


Registered: 02/24/13
Posts: 2035
Loc: Ontario, Canada
If you use distilled exclusively in your system, then don't get too hung up on corrosion protection. In your climate, I'd be fine with 60/40 h2o/glycol (and my personal preference, a surfactant based wetting agent). I premix the coolant with distilled before I pour it in, and adjust later for any flushwater that may have been used and remained in the system, if it's any consequential amount.
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#3332447 - 04/03/14 03:17 PM Re: What's the best way of getting proper coolant mix? [Re: Gokhan]
mrsilv04 Offline


Registered: 12/08/06
Posts: 6847
Loc: Illinois
Originally Posted By: Gokhan
Originally Posted By: mrsilv04
A higher concentration of coolant has a higher boiling point... better than lower. Not sure where you got the opposite.

Of course, it has a higher boiling point and lower freezing point.

I am talking about the cooling efficiency -- how much a coolant can extract heat from the engine. Water is more efficient than antifreeze in extracting heat; so, in principle, your engine would run cooler with 100% distilled water than with an antifreeze mix. Of course, there would be little corrosion protection.


I give up. Go buy a new car. Problem solved.

horse
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Whatever you do... do NOT speed through the town of Gauley Bridge, WV.

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#3332476 - 04/03/14 03:58 PM Re: What's the best way of getting proper coolant mix? [Re: Gokhan]
Wolf359 Online   content


Registered: 04/27/12
Posts: 651
Loc: MA
Originally Posted By: Gokhan
Originally Posted By: mrsilv04
A higher concentration of coolant has a higher boiling point... better than lower. Not sure where you got the opposite.

Of course, it has a higher boiling point and lower freezing point.

I am talking about the cooling efficiency -- how much a coolant can extract heat from the engine. Water is more efficient than antifreeze in extracting heat; so, in principle, your engine would run cooler with 100% distilled water than with an antifreeze mix. Of course, there would be little corrosion protection.


As someone else said, you are over analyzing things. Your car has fans, if it gets too hot, the fans will kick it. It's a moot point. You might save 2 cents in gas due to use less electricity to power the fans. Life's too short, just fill with water and move on. If you wanted to go nuts, make sure you use distilled water, but that would affect your savings from a going with a more efficient mix.

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#3332514 - 04/03/14 04:30 PM Re: What's the best way of getting proper coolant mix? [Re: Gokhan]
901Memphis Online   content


Registered: 08/14/10
Posts: 7134
Loc: Northern Kentucky
Guy at work insisted on filling his pt cruiser with straight antifreeze and wondered why it overheated in the winter. Now he has castor oil in there and said it doesn't over heat anymore.
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#3332544 - 04/03/14 05:07 PM Re: What's the best way of getting proper coolant mix? [Re: Gokhan]
thrace Offline


Registered: 08/31/02
Posts: 333
Loc: USA
Originally Posted By: Gokhan
I'll do a distilled-water flush. I have a separate radiator cock and engine-block cock, and I'll drain both. Specified system capacity is 6.6 qt per the OEM repair manual.

Do I just assume that this is the correct capacity and use 3.3 qt of concentrated antifreeze and top off the rest with distilled water to get the optimal 50/50 mix? Should I put a little more than 3.3 qt just in case?
If you can drain out more than 50% of cooling system volume, your plan should work.
However have found on some cars, cannot drain out half of the stated total coolant system volume. If true, cannot put in full strength antifreeze in volume of 50% of stated total coolant volume and expect 50/50 mix after water flush. In that case, if coolant not too dirty or acidic, consider just drain and measure volume and fill with home brew or store bought 50/50 mix and repeat at or more often than manufacturer's recommendation.

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#3332547 - 04/03/14 05:11 PM Re: What's the best way of getting proper coolant mix? [Re: Gokhan]
SHOZ Offline


Registered: 06/28/03
Posts: 2365
Loc: Illinois
I flush mine with distilled. Then top off with 70/30. It usually comes out at 50/50.

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