![]() ![]() Rust builds up in the system, inhibiting coolant flow, which causes overheating. The acid eats away at head gaskets and intake gaskets. Cooling systems that use Dexcool exhibit more acid buildup and rust in the system when the coolant level gets low and oxygen is allowed to enter the system. ![]() It's supposed to last 5 years or 150,000 miles, but there have been problems with this coolant. In the 1990s, GM introduced an engine coolant called Dexcool. GM suggests flushing Dexcool for the first time at 150,000 miles. If I have Dexcool in my car, can I leave it in for the life of the car? Head gaskets blow, heads warp, and the engine suffers major damage. The water pump overheats and fails due to a lack of lubricant in the coolant. The coolant stops flowing through the system, clogs up coolant passageways and water jackets, radiators, and heater cores. The coolants chemically react and form a gel rather than a liquid. What exactly happens when these coolants are mixed? To guard against major engine failure, read on. There are some coolants that claim compatibility with Dexcool, but I would rather err conservatively and add what the system is supposed to take rather than gamble. When mixed together they form a gel-like substance that stops coolant flow, and consequently, the engine overheats. The green and orange coolants do not mix. This is one of those questions usually asked after the fact, and usually engine damage has already occurred. Can I mix green coolant with orange coolant? What is coolant?Ĭoolant (sometimes referred to as antifreeze or radiator fluid) is used to regulate your engine temperature and prevent it from overheating. And in mixing any antifreeze with water for a 50/50 mix, the use of distilled water is highly recommended. On GM's own consumer site, the debate regarding its Dexcool antifreeze continues. Orange vs green: coolant basics you need to know Understand the difference between coolants, and how to look for problemsĮditor's Note: This article was originally posted in 2009. ![]()
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