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This would only make sense if you have an automatic transmission. What is probably going on is this; Your coolant flows through the radiator to cool down the motor. Your transmission fluid does the same. My guess is that you have a leak inside of your radiator, and the coolant and Transmission Fluid are mixing. This is a serious problem as your transmission is not cooling properly, and probably being damaged everytime that you drive the vehicle. I would suggest a new radiator.

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โˆ™ 2006-06-17 07:02:40
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Q: How do you fix a 1998 GMC Sierra with a coolant leak you can't find if there also seems to be a reddish color in the reservior and you already checked the top hoses?
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