![]() Important: To assure intended system performance, inform the customer that the cooling system MUST be maintained in a completely full condition and use radiator cap p/n 15075565. Any deviation or stubstitution may result in substandard cleaning/flushing or system damage. Due to the complexity of these procedures, the following repair procedures must be strictly adhered to in order to achieve the intended results. Vehicles equipped with DEX-COOL coolant, which may have been operated for extended periods of time with a low coolant level, usually in excess of 32,000 km (20,000 miles), may be susceptible to formation of a rust-like material.įlush the cooling system using the repair procedures that follow. Customer compaints that the heater is inoperative, blows cold air, engine may exhibit an overheat condition, or the cooling system has a rust like substance in it. After the problems became apparent with DEX-COOL, in 1999 the following Technical Service Bulletin was issued to the General Motors dealerships. General Motors introduced DEX-COOL in 1996. Yet, here is something that claims to be able to do both ways or neither way. Remember conventional green coats everything, and newer coolants eat away/clean everything, complete opposites. I am personally wary, as should we all be. It clearly tells you it can be added to anything. We have all seen this stuff on the shelf. No coolant will last the life of the vehicle, and must periodically be flushed. Realisitically either one is suitable, as long as its maintained. ![]() If you are switching from one to the other, make sure you completly flush out the coolant system. I suspect it does this for reasons mentioned in the lawsuits. Dexcool, when mixed with anything else except dexcool can eventually cause problems like heater core and water pumps failure. Havoline had the original patent on Dex-Cool and manufactures it for GM. One coats with a "build up", one eats away build ups. Dex-Cool (ethylene glycol) is identical to the Chrysler & General Motors factory fill. They are different chemicals, and operate in totally dfferent ways. ![]() When coolant maintenances are performed it eats away corrosion and keeps parts looking new, ideally, without damaging any seals in the coolant system. Either way, that coating is just how it operates.ĭexcool, as well as some other newer coolants are acidic. I "think" this is one way it protects the metals from rust and corrosion, but not sure on that one. The old school green coolant coats everything it touches, and there is nothing wrong with that coating. This kind of puts the ball in your court if you fill it with green and have issues.Here is another bit about dexcool vs green coolant. Always useĭEX-COOL® (silicate-free) coolant in your vehicle. Require changing sooner, at 30,000 miles (50 000 km) Notice: Using coolant other than DEX-COOL® mayĬause premature engine, heater core or radiatorĬorrosion.
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