Temp gauge issue....

Posted a couple days ago. Had my gauge cluster sent out to a place in Florida, i was having issues with my MPG gauge (under rpms) and my temp gauge. Both were faulty. Sent to the place, they replaced the motors on all gauges. I got the car back, all gauges were fine. The mpg gauge is still working great (it was annoying as hell) but now my temp gauge has gone back to doing what it was doing before. For the first day or two it was working great.

What its doing is its just stuck, at first all the way on cold, then on hot. When i turn the car off and on it moves, then gets stuck in one area. I did a sweep test and once again the temp gauge doesn't move anywhere its just stuck. This after it worked perfectly for a day or two.

Before i send it back to the place i was just wondering if their is anything else i should be looking for. I think there is a slight leak in my car somewhere, but only when i accelerate lightly. i dont think this has anything to do with the temp gauge but who knows.

Originally when i had the car looked at months ago everything was fine in terms of thermometer and such. I was just told it was a faulty cluster. Any opinions? Again i sweep test and the thing doesn't move... just kind of spazz's out back and forth in one small area. Its weird.