ok so i have an 88 vert with a 13b Turbo swap, well the other night, i noticed the temp going up, to the top line VERY VERY SLOWLY, but never hits the VERY VERY TOP RED, just a tab under the white line....no coolant missing or leaking..... what is the problem....

 

U might have air in the system maybe it happened to me once or the thermo is not opening up if u have one.

 

chek your Thermostat? maybe its not opening..? replace ur Radiator fluid..... do u use a fan shroud? if not ..put 1 on.. get a Vented Carbon Fiber hood