91 GXL 5speed. i have no sign of leaks in either the hoses or radiator but my add coolant light is still coming on and off and my temp keeps goin up and down and i still lose fluid some how. ive flushed the system and put new coolant and water in it and it still does it. any suggestions on what i should try?

 

When you filled the cooling system, did you remove the air bleeder, if you have one? Are you definitely losing fluid?

 

did you check near the water pump? your water pump could be bad or the gasket between the pump and engine could be leaking.