Fox,
I don't know what your temperatures are there but when you are driving the car is going to get warmer in traffic and stop and go on the highway as the fan alone tries to pull air to cool it. As for the gurgling into the overflow tank, that is what it is there for is to save water. When you first shut the motor off, and especially after a hot day, you will get a huge temperature rise and it will force water out. The tank catches it and then as the engine cools pulls it back into the system. I put a little to much in my overflow tank other day and drove to Redding and back in 117 degree temperatures and when I shut the motor off, mine over filled the overflow tank and I had some water running down the driveway. I wish my Coupe had one of the cheap plastic ones instead of the high priced brushed aluminum one that I can't see into. That is where I add water in my other cars as they have a hot and cold level and it is easy to tell if you are over full or low.
Ron
