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Coolant mixed with transmission fluid
​We’ve all become accustomed to the idea that radiators can fail and cause water or coolant to contaminate the transmission. The fluid will have a milky look, like a strawberry or chocolate milkshake, depending upon how badly burnt the transmission was when the water entered the transmission fluid cooler. And there are other signs of damage from coolant, such as rusting parts, swollen rubber seals, or gasket material and clutches flaking, to name a few. Some vehicles, like the Mercedes Benz equipped with the 722.6 transmission or the 2004 and later Nissan vehicles (most common Pathfinder, Frontier, Xtera) with the RE5R05A transmission, are slightly different. When these transmissions are contaminated with antifreeze known as glycol ethylene it may not be obvious. Almost similar like blown head gasket.

​​This is true on other vehicles that use some type of coolant similar to glycol ethylene, such as Volkswagen and Audi. The problem is the fluid may not get that milky look
we’re used to. These vehicles require a testing kit to determine if there’s any transmission fluid contamination.
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Test kits are available through local  San Diego transmission repair parts suppliers and all over the internet: This is where Google comes in handy. With today’s internet, you can find almost anything just by searching. Many of these test kits are approved by OE manufacturers. Not all test kits are the same. Some only test for water while others will test for glycol ethylene or other contaminates.
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It’s better to use a kit that tests for specific contaminates rather than a kit that claims it’ll test for everything. One that tests for glycol ethylene may not give accurate results for water or other antifreeze chemicals.
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As with any product, you get what you pay for. What may seem strange, but not uncommon is the fluid in the transmission may be contaminated with coolant, but transmission fluid isn’t present in the radiator. That’s because of the difference in pressure: There’s a lot of pressure in the cooling system, but very little in the transmission cooler, so coolant will push into the transmission, but not the other way around. ​
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Transmission Fluid / Coolant Contamination.