Q: Lost all transmission fluid near radiator overnight 2004 GMC Sierra

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What would cause all of my transmission fluid to leak out near coolant lines over night

My car has 166000 miles.
My car has an automatic transmission.

Hello - there are fittings at the radiator where the transmission oil lines go into the radiator side tank. Perhaps one or both of these fittings came loose, or broke - leaking fluid from that point? Gravity would do the rest. I recommend an oil leak inspection performed by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, and give you an accurate assessment of damage and cost estimate for repairs.

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