Are you taking into account full "system capacity"? If you drained the system it's going to take more than a single bottle. Also, smell by the dash and feel the floor. You could be leaking from the heater core or related lines.

how much should it take to fill. ive put like 1 1/2 gallons in and it keeps going down. and where at by the dash? also it drains very slowly. could it be because of air in the system?

I don't have my Haynes right by me but i think the radiator alone is almost 2 gallons. Glove box area.

also i have full aluminum racing radiator about 2inches thick

Stock "system capacity" is 7.2 liters so if your aftermarket radiator is bigger, the overall capacity will go up. As far as how much...not too sure.[DOUBLEPOST=1411347758][/DOUBLEPOST]I say fill it till it stops, run the car for a second then top off. Repeat. Then keep an eye on it for a couple days while the air pockets work their way out.

i guess i didnt fill it up enough i just filled it up more now it dont drain thanx man for ur help

No biggie man.