I am new to this forum. I own a 2006 Chevy Cobalt that is not running due to an accident. I hit someone who ran a stop sign and now have to replace my radiator. I bought a replacement radiator and am ready to change it over. The radiator is empty of coolant due to the accident. I took off everything in front of the radiator, headlights and mounts, bumper and bumper guard. I am now ready to remove the radiator but when I tried to loosen the bolts for the transmission fluid cooling line it hissed and bubbled so I had to tighten it back up. I am so close to getting my baby back on the road. What am I doing wrong? What is the best way to remove the radiator? Any help would be greatly appreciated.