I have to add coolant every couple months but i don't see a leak, is there something i'm missing?
coolant on 2004 Volvo S60
Check at the bottom of the radiator, on the sides for signs of coolant. The radiators leak quite often on these and it's a good chance this may be your leak.
1 more answer
I would suggest pressure tesing the cooling system and adding dye. If the pressure drops, there is a leak. You also could be burning coolant, which would indicate a possible cylinder head gasket issue.