The Dex Cool coolant used in the 1999 Blazer seems to react with the engine in some models causing a lot of rust that gets into the heater core. I've had the entire system flushed numerous times, heater core replaced twice, water pump replaced, radiator cleaned out and repaired and all hoses replaced. Has anyone experienced the same problem and found a workable solution for it. Has anyone tried changing to regular antifreeze with any success? Any suggestions will be appreciated.How do I keep rust out of the coolant system of a 1999 Blazer?It shouldnt be causing rust if the ratio is correct. Iron Oxide becomes a problem with the 4.3's if your mix is less than 40-60 af/water.
Dexcool is an organic acid technology (OAT) antifreeze. When it is mixed with Ethylene Glycol they can remove the corrosion inhibitors and cause rust. They can also Gel and combined with the dexcool dye it may look like rust. You should start from scratch, flush everything out and use a regular ethylene Glycol. You may be causing damage by electrolysis to components if you don't get this problem straightened out.How do I keep rust out of the coolant system of a 1999 Blazer?you shouldn't have a problem if you mix the coolant and water 50/50. You can also use the green stuff. I used to work at a Chevy Dealership until i left there to go to a ford dealership as a technician and GM calls for 50/50. Personally i never seen a vehicle last 2 years with dex cool. I agree with the other answers about flushing your system again and putting in the premixxed stuff as it is very accurately mixed, just make sure its mixed half and half and you should be okHow do I keep rust out of the coolant system of a 1999 Blazer?use pink coolant.
BUY THE ALREADY MIX FORMULA
the mix Yourself formula needs that You put 50% water to the coolant
And guess what?
the tap water has chemicals that destroy the coolant(glycol) and turned into something else ,but, coolant
Your tap water is corrosive do not used as coolant.How do I keep rust out of the coolant system of a 1999 Blazer?You should have no problem using 'regular' antifreeze. I recommend the premixed stuff because it is mixed with distilled water, thus avoiding the mineral contaminants you get when mixing tap water and antifreeze.How do I keep rust out of the coolant system of a 1999 Blazer?I have used Dex-cool before and haven't had any rust problems. What kind of water are you mixing the antifreeze with? Tap water or distilled water. Always use distilled water which is available at any grocery store. It has been distilled to remove the minerals and using it will prevent any minerals normally found in tap water from depositing in the cooling system. Also make sure the radiator overflow bottle always has coolant in it which prevents air from getting into the cooling system. That is really important when using Dex-cool.How do I keep rust out of the coolant system of a 1999 Blazer?Flush radiator and refill with fresh anti-freeze. Most anti-freeze have rust inhibitors in the fluid. I never had this problem or that vehicle but I know regular anti-freeze helps with keeping the radiator from rusting. Get the pre-mixed anti-freeze. I dont think adding water would be a good idea.
