My 96 cobra guage is acting up, I bought the car two week's ago as soon as I left the lot the temp guage went to the A so I took it back they said it was the sending unit so that was replaced. The tech said the fan whould kick on at 206 and turn off at 198. Now the gauge will stay at middle for a bit and then go to the A after 20 min and then go back to normal WTF?? So iam I ok two drive like this till I get a new T-stat and a flush?