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Lower tranny coolant line seems to be leaking in my 2004 SS Supercharged M.C. on 2004 Chevrolet Monte Carlo

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Is this a leak that can cause about 1 gallon of coolant to disappear over a 20 mile run? There is no sign of leakage anywhere except there. The shroud is wet under there also. water pump, exhaust pipes, radiator hoses, radiator all dry.
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Thanks Roy for answering...I'm not leaking tranny fluid, I'm leaking coolant. You mentioned fluid so I just wanted to be clear. I'm not sure how & why those coolant lines run to the top % bottom of the radiator? What am I missing here?
sorry, had a senior moment. the 2 lines on the rad are trans cooler lines. if it is coolant, have it pressure tested to verify the location. 2 common spots are water pump and intake manifolds. a shop can insert a dye to locate the source.

Roy
Hi Roy! I know all about senior moments...Wouldn't I see steam coming from the top of the engine if the intake manifold was leaking? Would I also notice a decrease in power? Neither is happening. You are a huge help and I apologize for all the questions, I'm just trying to wrap my brain around this. Also the area around the water pump is bone dry.