Temp light The temp light is blue and stays on while I am driving but it only happens sometimes.

Well blue is OK when thermostat opens it should go off this means the car is at operating temp as long you do not have orange or red temp light should be OK hope this helps

Could be that the coolant level is a bit low and the flashing light is telling you this. The level will drop when the fluid is running thru the motor. When you turn the car off the level rises back to nominal level.
Also take a look on the list that I am giving:-----
Steady blue temp light = low coolant temp
Flashing blue temp light = electrical fault in coolant monitoring system
Flashing red temp light = low coolant level
Steady red temp light = overheating
Also,
I would suspect that your thermostat has possibly failed open and the car is not getting up to temperature. Coolant temp sensor could also be falsely reporting lower temp than actual without triggering any fault code.

I would replace the CTS and see what happens. If problem still exists do the thermostat.
Thank you Sir, I hope it will be solved. Have a nice day.