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Old 03-15-2020, 01:16 PM
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chemnick chemnick is offline
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Default Opinions on service life of coolant

Greetings!!
Back in 2013-14 when I restored my 67 GTO I went through everything including engine rebuild, trans, etc. Upon reassembly, I installed a 3-row aluminum radiator so I decided to use the GM Dexcool extended life coolant. I also used a bottle of Water Wetter. I did have a very slight heat issue the first summer but it has long been taken care of. Smooth sailing ever since. So to the question: Without any issues at present, should I be concerned about flushing/replacing coolant? Input appreciated!!!

Chemnick

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Old 03-15-2020, 01:36 PM
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ZeGermanHam ZeGermanHam is offline
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The general rule of thumb is every 2 years, but to be more specific it depends on the rate of pH degradation in your particular engine/radiator. If you want to keep track of things and change the coolant only when it actually needs to be changed rather than a predetermined schedule, buy some inexpensive coolant test strips: https://www.amazon.com/Cool-Trak-311.../dp/B000MIUJMO.

However, I'm not necessarily opposed to just changing it every 2 years regardless of pH. I think there is a benefit to making a routine habit of getting underneath your car and looking around for other potential leaks/issues while you're taking care of something else such as changing the coolant. Sometimes we need an excuse to get underneath and have a look-see.

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Old 03-15-2020, 03:27 PM
Goatracer1 Goatracer1 is offline
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Mine has been tested every fall for 18 years and looks good and tests good every year. I use a multimeter to check it.

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Old 03-15-2020, 04:40 PM
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Default Coolant check

Please explain method for checking coolant with a DVM.
Thanks. Gerry.

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Old 03-16-2020, 04:04 AM
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What is the preferred coolant these days for a vintage Pontiac? Is there something that helps protect the aluminum timing covered compared to the old products that didn't do that great of a job?

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Old 03-16-2020, 10:45 AM
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ZeGermanHam ZeGermanHam is offline
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Quote:
Originally Posted by dataway View Post
What is the preferred coolant these days for a vintage Pontiac? Is there something that helps protect the aluminum timing covered compared to the old products that didn't do that great of a job?
Like me, I'm sure most here use "regular" off the shelf coolant that is safe for engines that have aluminum components. You can also add an anode like so: https://www.rotometals.com/flex-a-li...4-npt-x-1-3-4/.

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Old 03-16-2020, 11:32 AM
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tempest1964 tempest1964 is offline
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Quote:
Originally Posted by 68 Firebird View Post
Please explain method for checking coolant with a DVM.
Thanks. Gerry.
I found this online:
https://www.readersdigest.ca/cars/ma...nt-multimeter/

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Old 03-16-2020, 11:48 AM
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Ahh...better change it in my 99 GMC with 119k miles.
Had 15 years and haven't touched it except for brakes, o/c's, and tires. No idea if was before that.
Course now something probly happen...

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Last edited by Region Warrior; 03-16-2020 at 11:58 AM.
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Old 03-16-2020, 07:23 PM
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Dexcool is supposed to be good for 5 years or 75,000 miles. Been running Dexcool in both of my newer GM vehicles and change it every 75k. No problems noted with either (Cadillac has 208K, Silverado 178K)

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Old 03-23-2020, 01:59 PM
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GM has been using Dex Cool since 1996. Their recommendation is 5 years or 150,000 miles, whichever comes first. It works really well. They also recommend distilled water. I am not sure about the voltmeter test. It has been a long time since I tried it. Dex Cool was formulated to better protect aluminum components better than the previous coolant. A lot of problems with it have been from the gaskets with the particular engines that it was put in. I have used it and will continue to use it in my Pontiac's.

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Old 03-24-2020, 08:41 AM
chrisp chrisp is offline
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PH test strips are a good item to use.

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Old 03-25-2020, 03:29 PM
Goatracer1 Goatracer1 is offline
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Default multimeter

Sorry I took so long to get back to you. To check condition of your antifreeze with a Multi or volt meter: Connect the Positive lead of the voltmeter to the engine block, set scale to 20 volts, Insert Negative lead in radiator coolant and read meter. If voltage reading is between 0.01 and 0.05 coolant's PH is okay.

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Old 03-25-2020, 04:38 PM
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Jerry H. Jerry H. is offline
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Quote:
Originally Posted by OG68 View Post
Dexcool is supposed to be good for 5 years or 75,000 miles. Been running Dexcool in both of my newer GM vehicles and change it every 75k. No problems noted with either (Cadillac has 208K, Silverado 178K)
Unless they have changed the formula, back it 2003 the Dexcool was good for 10 years or 100,000 miles. That's what we were taught in GM training school.

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