What did I do wrong?You used a 50/50 mix. Now I’m worried about the 4+ quarts of tapwater that are left. What concerns me is? I was only able to get 8 quarts of the 50-50 mix back in. For the corrosion and anti-freeze protection of a 50/50 mix, the mixed specific heat would be about 0.80 BTU/lb-degF which is still below what pure water can do for heat transport from the engine block to the radiator. So water is far superior for transporting heat per lb of flow than pure EG. Pure water has a specific heat assigned as 1.0 BTU/lb-degF and pure ethylene glycol is 0.60 BTU/lb-degF. The primary reason to change out your coolant mixture on a scheduled time interval is the degredation of the anticorrosive properties of the coolant. Pure water has been shown to provide better cooling capability than an antifreeze mix but does not give the required chemical protection. I don't have my owner's manual handy but a rule of thumb is at least 50/50 coolant to water mix and not to exceed 60% coolant. If the coolant (antifreeze) level is not high enough, it will not protect chemically against the aforementioned maladays. One of the major purposes of coolant, "antifreeze" is to maintain a proper chemical balance in the cooling system to deter acids and electrolysis. ![]() I choose to disagree with the posting using the temperature protection as the source for the percentage of coolant mixed with water. Look up how low this protects you and if your car doesn't see temps that low call it a day. What you are now according to your post is 4 qts of Dexcool and 8 quarts of water or a 33% mix. Doing this is a minor PITA and may take awhile since the thermostat is closed and the only passage around it is usually a small hole. You now have a 50/50 mix with all new coolant. If you are a perfectionist then you can flush the system with tap water until clear water comes out, Then drain out half the coolant capacity and replace with 100 % coolant. If you want it all out then you can use pressurized air to force the rest out and even then you won't get it all. You can't get all the coolant out gravity draining using the petcock on the radiator. I haven't had an issue since I got rid of my last car with green Prestone in it in 1999.Today I changed out the DEXCOOL in my C5 Corvette with new DEXCOOL. In close to 50 years of having my own cars I had lots of cooling system issues when the green stuff was the only stuff you could get. If you go to the old fashioned green coolant your coolant change interval will go to two years instead of five and you will have more coolant issues. I have never heard of anybody with a LS engine having any cooling system problems due to DexCool. My daughter let her 02 Olds go 6 years before I insisted she had to change it. I keep the coolant in the radiator until I reach 5 years and change it although it still looks like new. I have never had any issues since I purchased my 97 Vette which was the first car I had with Dex in it. GM has produced millions of vehicles with DexCool in them and only had issues with a few engines. The only thing left out of that small number of incidents is a so called class action law suit that doesn't have much oomph behind it since there are so few members of the class. Those engines had seals that were not compatible with DexCool. ![]() Anyone using Preston or any other coolant?It caused some problems in engines built more than a decade ago. I know most of you guys recommend Dexcool, but Ive read that it has caused problems. Make sure that you use a hydrometer and get the CORRECT coolant to water ratio to keep the engine from freezing or boiling over. I always use distilled water to dilute the coolant. ![]() Guys that live in places that seldom see temps lower than 32 deg don’t need coolant that protects down to -35 degs! Depending on where you live DEEP SOUTH or ARTIC TUNDRA North East you can use more or less antifreeze to water. Drain one last time and refill the system with the PROPER ratio DEXCOOL & WATER. If you want the best cooling system efficiency, drain ALL the coolant! Refill and drain the system with fresh water until it runs clean/clear. NONE of my cars have ever experienced a cooling system issue as a result of the coolant! PERIOD!Īs long as the system is properly maintained, is NOT mixed with a GLYCOL “silicate” (GREEN) coolant and has a sealed reservoir tank with the proper PSI cap, you will be ABSOLUTY fine. Dexcool is an ORGANIC ACID TECHNOLIGY (OAT) coolant. I’ve owned a 98 Coupe, 02 ZO6, 06 Coupe, 2011 GS! They ALL have DEXCOOL or equivalent.
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