greddy brether tank question

[motegineon]

ok so i bought the breather tank and got it all hooked up, what do ya know my car is overheating bigtime now...i figured it was just air in the system from installing the radiator adapter...but its still doing it, and what weird is even with the temps into the 200's the heater air is cold...does this mean theres air in the ehater hoses or my heater core i going out or what?

also here is a pic of the cap



now for the last question...obviously this isnt the same as a radiator cap, i thought the when the tank reached a certain pressure (ie 13lbs) that the cap would open, thus allowing the flud to over flow into the overflow tank...but with this cap it doesnt even have the spring or anything to go down past the nipple that goes to the overflow tank...so basically coolant is always flowing in the tank thus causing it to overfill and make the radiator lose its pressure since its basically always open right? i was gona go buy a real radiator cap and put it on but i wanted to check and see if maybe there is an explanation for this...

thanks