damn, stupid me

. There is no cap on the radiator though, only on the thermostat housing. I assume I should fill up the radiator from there until it's all the way up to that point? Isn't that too much fluid? In case there is too much coolant in the system it will be just returned to the reservoir, correct?
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1990 Eclipse GS-T (STOCK)
Planned mods: 15 psi boost; turbo timer; blow-off valve; 3" catback exhaust; alum. IC pipes.. for now