Hi, I'm a courier and drive about 100 miles daily in my city. I added Bar's Leaks Cooling system stop leak last week, which worked. Now I'm catching the temp gauge climbing to about 65% each morning after about 5 minutes of driving and after about 10 seconds it goes back to normal. It also occurs when I stop at red lights but infrequently. It happens about 8 times a day, but it only lasts for about 10-20 seconds. Did the stop leak gum up the thermostat?