[marokero]

Had the same issues after installing my T1R intake and having my coolant topped off. With the car on a level surface, with a cold engine, remove the radiator cap, and start the car without giving it any gas. You may cover the intake with a rag just in case some coolant spews over. You should see bubbles coming up, leaving the heater core, which is where these bubbles are causing the gurgling noise. Let the engine run until the fan kicks in, at which point the coolant level is going to drop. Hopefully by then most of the air bubbles have left the system. Cap off the radiator opening, and take it for a little drive. There should be little to no noise, and once you drive it for a while there should be no more noise. Good luck!