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Old 08-27-2013, 04:49 PM   #1
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radiator coolant testing/ph

have a question on checking the radiator coolant Ph., a friend we were camping with over the weekend recommend I do periodically. I replaced the radiator and coolant in the spring and added Fleet Charge as recommended by Freightliner.
I called NAPA and they sell a test strip for testing the fluids- is this the proper way to test or is there a better way?


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Old 08-27-2013, 05:30 PM   #2
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That's what I use. There are a few more expensive testers, but I prefer the strips.

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Old 08-27-2013, 06:09 PM   #3
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Originally Posted by Kjlunda View Post
That's what I use. There are a few more expensive testers, but I prefer the strips.

are you getting yours at NAPA? do you the name of the strips or all they all pretty much the same?

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Old 08-27-2013, 06:52 PM   #4
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The test strips test for ph, SCA, and 2 others, for which, I forget. I had to buy a bottle of 50 strips, which state they are good for 1 year after opening. I later found out you can buy just 1 or 2 from a truck repair shop sometimes.
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Old 08-27-2013, 07:29 PM   #5
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I went to an auto supply and bought some test strips - and they said right on them they were not to be used for testing "red" anti freeze?
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Old 09-01-2013, 07:20 PM   #6
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tested the coolant today.
ph.- 7.5 (8 is normal)
freeze point 50 =-34/-37
nitrite - ideal at 1200

have a whole year to do another 49 tests, LOL they come in a 50 pack.
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Old 09-01-2013, 07:46 PM   #7
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Testing for acid content is easier with a (DVOM) digital volt ohm meter. Just stick the + lead in the coolant. Don't let it touch the metal in the radiator just liquid. Then touch a good ground with the Neg. If the acid content is up you have everything you need to create a small battery. At least two different metals: brass, copper, lead, aluminum etc. and acid. That makes a battery. Your DVOM set on low DC Voltage scale will show a voltage.

Don't ask me what voltage would tell you that the amount of acid in the coolant is to high because i can't remember. Maybe somebody else has done this and would know. I'd suggest checking a freshly cleaned system and and take a reading. Then check dirty systems and determine the voltage spread. I think a voltage up in the 3-4 volt range would be high. The high acid content is more corrosive to the cooling system. That's why it is checked.


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