heater core bleeder valve

hi last winter i was trying to loosen the bleeder valve and it broke off now i just rmemeber it broken off and cant bleed it there is a socket like 10mm i think i cant remember that i can put on it but i wanna know if i really put force on it will it snap off too this be the insert to hold the bleeder vavle its pretty tight in ther and i didnt wanan break it off too

any info guys

Soak it with Pb Blaster or any rust bust, try taking the entire fitting out not just the bleeder screw, also in the future always post the year and engine.

oh ok ya its the bleeder screw holder fitting the screw broke right off

sorry is the Lumina 91 3.4 engine

oh by chance how do u loose the siezed head light screws on same car i cant ajust them and i put wd 40 in the shaft area but no luck

WD 40 is no good for freeing up rust, Seafoam or PB blaster and let is soak for while.

oh i thought WD 40 was always to free up rust

will seafoam and the PB stuff be sold and canadian tire?

From NYS, USA. I don't know.

ah ok ill look but i always learned that wd40 was a rust remover

so why does the headlight screw sieze up? its pain in ass i cant adjust the dam headlights i dunno why they make it a 90 screw style lol

i have other questsion about my damn car but i busy but thank you so far for the help

ill look if there such things as PB blaster or seafoam