Found a coolant leak today. Looks like the GM stop leak tabs have it under control for now. Trucks with a few miles on them may want to check this area. I don't have my digi cam with me now. It's the tube that feeds the oil cooler from the water pump. It's leaking at the water pump connection. 2 12mm bolts. Mine were snug but not tight. You can spot this under the front driver side of the engine right below the exhaust manifold. One thin paper gasket there. Any one know if the oil cooler assy. has to be removed to change that gasket?