It takes about 10 minutes for the steam to come out (car gets to operating temperature pretty quickly because it's about 110 degrees in my garage). And the steam was just barely coming out. Steam only started coming out of the cap after I replaced the radiator and the steam comes out less and less every time.Ah, ok, thx for clearing that up.
Immediately? Or did it take some time to warm up before steam came out? Was it coming out forcefully, or was it possibly just the previously burped out coolant steaming off gently?