I have a Griffen radiator in my 91 mustang which does such a good job of cooling down my coolant that it never goes above 165 degrees no matter how hard I push the car or for how long. The one thing that concerns me though is that when I am stuck in traffic or moving under about 5 mph, I can see the temp guage rise. After about 45 seconds it approaches close to 200 degrees. I havnt had the car too long so I havnt seen it go much higher then that, but this somewhat concerns me. Once I get moving again, the temperature quickly drop down to 165 degrees again. Am I concerned for no reason or is something wrong here?