You can also use test strips (available at a quality auto parts store for $5 or less), they work on both green and red types too. 0.7 V or greater - antifreeze is unacceptable.0.5 V to 0.7 V - antifreeze is borderline.0.2 V to 0.5 V - antifreeze is still good.Your readings (regardless of negative symbol on readout) should be: Always be careful when opening the radiator cap on a warm engine). Make sure the coolant is warm but not HOT (this is for SAFETY reasons as well as accuracy of your readings. You then place the positive probe in the neck of your radiator, making sure that the positive probe touches nothing but the antifreeze. You put your negative probe to the negative post on your battery. One interesting spec I found is to use a multimeter. Green will keep you protected thermally just as well as red.Īs for deciding when to change your antifreeze, don't go by miles or you WILL certainly have seal and mechanical failures. If you choose to continue using green, just check the alkalinity more often. If you started off with green, GM recommends switching to Dex-Cool in their technical service bulletins. OEM style additives designed for use with the green antifreeze (propylene glycol) may reduce the durability of Dex-Cool. These additives may cause gumming of the antifreeze. They originated in Euro/Asian markets and are not compatible with Dex-Cool. Also make sure to stay away from 'organic based' rust inhibitor additives. If your vehicle came with the inferior green stuff (propylene glycol), you must do a complete and thorough flush before switching to Dex-Cool. Concentrations greater than 67 percent or less than 50 percent are not recommended. For maximum protection against freezing in extremely cold areas a 60 percent solution (3 parts anti-freeze/2 parts water) can be used. Longer lasting (Dex-Cool has been shown to remain above 95% of its original concentration after 150,000 miles in automobiles)įor optimum year round protection against freezing, boiling and corrosion, a 50 percent Dex-Cool solution (1 part anti-freeze/1 part water) is recommended.100% biodegradable in its pure unused condition.It is Nitrite-, borate-, phosphate-, nitrate- and amine-free.Contains NO silicates, resulting in longer lasting water pump and engine seals longer shelf life.Havoline had the original patent on Dex-Cool and manufactures it for GM. I also have contacted GM and DC service departments to verify this information and they certify it is 100% accurate as of their October 2002 technical publications.ĭex-Cool (ethylene glycol) is identical to the Chrysler & General Motors factory fill. I have tested the below information thoroughly to be accurate on my own GM and Daimler-Chrysler vehicles. The following information has been gathered by myself through contacts in the automotive industry and my personal mechanical experience. Back to "Maintenance" All about Dex-Cool®
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