The Dex-Cool coolant may have reacted with the plastic. Some have claimed that chemicals in the Dex-Cool softened the plastic, eventually eating through it and causing the leak. Over time, the plastic softened, causing coolant to leak into the crankcase or out of the engine.
Specifically, GM changed their intake manifold gaskets to a plastic carrier with silicone sealing strips around the edge. However, the root cause of the intake manifold gasket failure was the poor design of the gasket and not the Dex-Cool. The hole in this gasket was NOT caused by Dex-Cool. It’s true the intake gaskets in GM vehicles failed at an extremely After that, Dex-Cool gained a horrible reputation as a bad coolant and many shops recommended removing Dex-Cool and refilling with another type of long lasting coolant. Class action lawsuits were filed and GM offered settlement. GM switched over to Dex-Cool in their engines and shortly thereafter, the intake manifold gaskets in those same GM vehicles failed at an astounding rate. In addition to providing protection against freezing, Dex-Cool provides anti-corrosion and anti-foaming additives to prevent galvanic action and corrosion from forming in a vehicle’s cooling system. Dex-Cool coolant is based on an organic acid technology that provides longer life than traditional silicate based formulas. Repair Topics > Cooling System Service > What is Dex-Cool coolant? What is Dex-Cool coolant? Dex-Cool® coolantĭex-Cool coolant is a registered trademark for a coolant used in GM vehicles.
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