I just had my system bled of any air pockets out of my cooling system by a Viper tech however,my temp changes alot it's almost like my gas gauge. It still never gets close to the red but it will go from 190 to 215 instantly and then back again jumping all over the place under stop and go driving. Do I need a new temp gauge or is there something else the tech can do to make the temp more stable? Thanks in advance.