DFRobot_GDL refresh text without clearing screen

I have a Fermion: 1.8" 128x160 IPS TFT LCD Display that I am using for a temperature monitor.  I'm using the DFRobot_GDL library to interface with the screen from an Arduino Pro Micro.  Every few seconds a new sample is taken and I update the text on the screen.  How can I update the text without doing a fillScreen first?  The problem is this causes a noticeable flicker when fillScreen runs.  If I don't clear the screen the numbers just write over each other and it becomes unreadable.  

Here is the code I'm using:
 

screen.fillScreen(BackgroundColor);
screen.setCursor(0, 0);

screen.setTextColor(LabelColor);
screen.print("TC   ");

if (calculatedTransferCaseTemp <= transferCaseTempCool) {
  screen.setTextColor(TransferCaseFluidColdColor);
}
else if (calculatedTransferCaseTemp > transferCaseTempCool && calculatedTransferCaseTemp < transferCaseTempHot) {
  screen.setTextColor(TransferCaseFluidWarmColor);

}
else {
  screen.setTextColor(TransferCaseFluidHotColor);
}

screen.print(calculatedTransferCaseTemp);

screen.println("F");