Inherited a 2007 Cord Focus SE 2.3 ltr...just noticed the temp gauge going crazy...like when get on hwy. and get up to about 60 mph the temp gauge goes immediately to the red area...but then when slow down to about 40mph the gauge acts accordingly and immediately falls back to normal area...speed up to 60 and repeat of everything I just explained! Checked out engine and it was not hot not was the resovoir changing it's level of fluid and when took off resovoir cap nothing showed was then or ever hot! What the h__l? Could needing a oil change very, very badly have anything to do with it?