coolant burping question ea82

[Cmosfet]

Hello,

In my quest to revive this 1991 SPFI loyale, i replaced all coolant hoses. I went to burp system last night. I have read lots here on how to do and still forgot to turn heater on full...arggg. I will try again tonght but have a quick question. I fired it up and sounded great, idled high for abit then right down nicely. Radiator cap off i watched as it would spit some out, fill it up a lite. Did that a few times while checking temp gauge and feeling upper rad hose. Then all of the sudden,10min or so later, it didnt just burp it started thowing up coolant from the filler tube(rad cap). It was late and i stopped. before this the hose felt warm and i figured the tstat was open. Maybe not though. Was my big mistake not turnig heater on high? Also should put it on a slope or ramps to promote coolant to get into heater core? I did read a post from miles that said it would geyser if a big bubble came through. It kinda freaked me out the amount it was spewing so i figured i would stop and do some research.

Thanks all in advance, learning lots here, hope to get the beast(im calling it "bean" for some reason hahaha) on the road soon.