The gurgling sound is air. Start the car w/ the rad cap off. NEVER add water or coolant to a running temp engine w/o it running. Let it get to operating temp and add water or coolant until it is full and hot. Like I said earlier, click the cap to the first click. It will keep the water from sloshing out at higher rpm's. You will need to keep an eye on the level because it will evaporate because of no seal on the system. Pain in the ass? Yes. But it will prolong the life of the patch.