My sister's Cruze started to loose coolant. I couldn't find external leak. I was trying to figure out how to put a new head gasket on, with these variable cam engines it seems like a real peach. Just for kicks I got one of the loaner tools from Advance and pressure tested the system. Found the coolant return line from the turbo leaking. It's going to be a headache, but my god I was glad to see that external leak as opposed to head gasket. I think that when the engine was running the sufaces were so hot that the stuff just burned off. Score one for basket troubleshooting.