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If there is external coolant visible, you have to pressure test the system and find the leak. You can pop the cap off with the car running too and see if coolant is recirculating back into the radiator. I believe the ls1's are like the lt1's and the coolant will enter the radiator at the port by the cap. You might need to remove a little bit of fluid so you can actually see whether or not it is flowing in.
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