Recent Topics
M1 HM or PHM
by car51
04/30/16 05:18 PM
Rotella T6 5W40, 8,000 mi, '09 Cobalt SS 2.0T
by GermanAutohaus
04/30/16 04:37 PM
Accord / Jetta Saturday Detail {PICS}
by gregk24
04/30/16 04:22 PM
MOTUL 8100 X-Cess 5W40, 8,014 mi, '04 Audi A4 1.8T
by GermanAutohaus
04/30/16 04:00 PM
Free Riding Mower Needs a Carb
by Delta
04/30/16 03:41 PM
Rate my lawn plugs
by JHZR2
04/30/16 03:38 PM
Rotella T6 5W40, 14,000 mi, '13 Audi A6 3.0l TFSI
by GermanAutohaus
04/30/16 03:24 PM
#915 over FK1000P?
by Phishin
04/30/16 03:04 PM
Rotella T6 5W40, 6,480 mi, 2015 Ford Explorer 3.5l
by GermanAutohaus
04/30/16 02:46 PM
Rotella T6 5W40, 7,600 mi, 2011 Audi A5 2.0T TFSI
by GermanAutohaus
04/30/16 02:38 PM
Rotella T6 5W40, 8,500 mi, 2004 Ram 5.9l Cummins
by GermanAutohaus
04/30/16 02:22 PM
Rotella T6 5W40, 8,000 mi, 2012 Jeep 3.6L V6
by GermanAutohaus
04/30/16 02:02 PM
Newest Members
paydase, Scopx, speedysmitty, hdwizard21, raihan
57751 Registered Users
Who's Online
67 registered (avacado11, 69GTX, AirgunSavant, 901Memphis, Bandito440, 2015_PSD, 4 invisible), 1821 Guests and 329 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
57751 Members
66 Forums
248265 Topics
4059548 Posts

Max Online: 2862 @ 07/07/14 03:10 PM
Donate to BITOG
Topic Options
#892460 - 05/03/07 04:56 AM How to adjust antifreeze pH?
jzmtl Offline


Registered: 03/24/07
Posts: 9
Loc: Montreal
What chemical do I use to increase pH of antifreeze? Is sodium hydroxide okay? I tried google but no one is saying what to do besides get a cooling system flush.

Top
#892461 - 05/03/07 06:35 AM Re: How to adjust antifreeze pH? [Re: jzmtl]
George7941 Offline


Registered: 05/10/05
Posts: 1731
Loc: Toronto, Canada
I don't think anybody uses a chemical to increase the pH of coolant. If your coolant is that acidic it is time to replace it anyway. There are other additives in coolant that will be depleted by the time coolant becomes acidic.
_________________________
2006 GMC Sierra 4.3l, NV3500,G80 locker rear, Formula Shell Synthetic 5W30, Wix 51036, Dexcool.
1987 BMW R80

Staying out of the right lane a lot.

Top
#892462 - 05/03/07 06:50 AM Re: How to adjust antifreeze pH? [Re: George7941]
jzmtl Offline


Registered: 03/24/07
Posts: 9
Loc: Montreal
That's the thing, the coolant is new. From what I read pure prestone is 10.5, but afte mixing with water it's down to 9.

From description of coolant flush, they say after adjust coolant/water ratio, they use a pH concentrated coolant to adjust pH. So they must use some sort of base to get it right, but no one is saying what.

Top
#892463 - 05/03/07 07:48 AM Re: How to adjust antifreeze pH? [Re: jzmtl]
onion Offline


Registered: 02/04/07
Posts: 2097
Loc: kansastan
Sodium hydroxide is some pretty strong stuff... I'd be cautious about it. Sodium bicarbonate works fine for aquariums...

What PH are you looking for? Why?
_________________________
The invisible and the imaginary look exactly the same.

Top
#892464 - 05/03/07 07:08 PM Re: How to adjust antifreeze pH? [Re: onion]
jzmtl Offline


Registered: 03/24/07
Posts: 9
Loc: Montreal
from around 9 to 10.5, because that seems to be the optimal pH for antifreeze.

Top
#892465 - 05/03/07 07:13 PM Re: How to adjust antifreeze pH? [Re: jzmtl]
benjamming Offline


Registered: 01/03/04
Posts: 5795
Loc: northern Alabama
But you say that you have a pH of 9 right now & are targeting 9-10.5. Tell us again why you are wanting to adjust the pH.

Top
#892466 - 05/03/07 09:20 PM Re: How to adjust antifreeze pH? [Re: benjamming]
John K Offline


Registered: 09/06/03
Posts: 950
Loc: Loveland, Ohio
Sodium bicarbonate will typically raise the pH to less than 8.5. It 'sounds'(?) like you are assuming that 10.5 is the ideal pH because that is the pH of concentrated antifreeze. I think that a pH of 9 should be fine. Depending on what type of water you mixed with the antifreeze you run the risk of elevating the pH too high using sodium hydroxide. Higher pH is good for iron/steel, not sure of optimum for aluminum, but if you have any copper in the system raising the pH would not be a good idea.

Top
#892467 - 05/03/07 09:28 PM Re: How to adjust antifreeze pH? [Re: John K]
John K Offline


Registered: 09/06/03
Posts: 950
Loc: Loveland, Ohio
Well, I did a search and found an MSDS for Castrol antifreeze that listed the pH as 10.5-11.0 for 50% antifreeze. If that is what your pH should be and it is at 9.0, it probably means inadequate rinsing of an acid cleaner or dilution with some hard water??? If there are contaminants in the coolant then I think you'd be better off replacing the antifreeze, rinsing, and using distilled water to dilute the new stuff with.

Top
#892468 - 05/03/07 11:59 PM Re: How to adjust antifreeze pH? [Re: John K]
1sttruck Offline


Registered: 03/20/04
Posts: 4378
Loc: Camas, WA
I like using 50% coolant as a flush, and just buy twice as much when changing it. One of the reasons is to let the flush have first crack at dealing with remaining chemical issues in the system, so that the coolant intended to remain in the system starts off as designed, with the best shot at coolant life. Coolant isn't that expensive considering how long it remains in service, compared to engines with corroded, leaky freeze plugs and other such things from poorly maintained cooling systems (two friends have had this problem).

Top