Recent Topics
SpaceX at Hawthorne, California here I come
by HTSS_TR
08/24/16 12:31 PM
Electrical short? '95 Caprice lt1
by gallydif
08/24/16 11:40 AM
Liqui Moly Mos2 in BMW/Mercedes inline six
by OldEuroCarLover
08/24/16 11:16 AM
Subaru Oil Filter Installed in Dodge Ram Trans?
by dan0928
08/24/16 10:34 AM
Mobil 5w30 Super 5,000 OCI, bought on clearance...
by FlyNavyP3
08/24/16 08:42 AM
Android 7 Nougat out.(nexus devices)
by Rand
08/24/16 07:58 AM
Australia to lose its ute?
by supton
08/24/16 07:42 AM
Should I continue using HM Oil after gaskets?
by Fahrenheit
08/24/16 07:03 AM
John Deere 400 garden tractor oil
by Bighorn2500
08/24/16 06:58 AM
Safety violation? who knows...
by CourierDriver
08/24/16 06:14 AM
82 Yamaha Virago 750 engine oil
by Trigger
08/24/16 06:02 AM
Supercheap Auto Father's Day Version 2 sale
by KL31
08/24/16 05:39 AM
Newest Members
dan0928, basher, Bandita, DaveyJones, OldEuroCarLover
58904 Registered Users
Who's Online
91 registered (2015_PSD, 1JZ_E46, AlaskaMike, Altydoc, AIRJAC3, 8 invisible), 1660 Guests and 6 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
58904 Members
66 Forums
253488 Topics
4161041 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: 1788
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 , Formula Shell Synthetic 5W30,Dexcool.
1987 BMW R80 - sold
2015 Honda CBR300R

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: 5813
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