Well, Im back. I got it to the point where I got WARM air (not hot) so I left it at that. It was like that with no over heating for about a week now.

The past 2 days or so, its been blowing nice hot air. AWESOME! except now randomly today it decided to start overheating (but still blowing hot air).

I tried bleeding it again. But as usually, once it starts getting warm (maybe around 160 or so, while having the throttle sit at 1500 rpms. It will overflow out of the radiator cap. I have to rev it to at least 3,000 but sometimes it will still overflow, so I throw the cap back on before it all comes flying out.

Edit, just went out when it was pretty warm already and tried burping. No bubbles came up. And it was slightly over 200 degrees. But I did notice when i rev'd it up. around 3000 rpms or so, the temp did drop a bit.

 

Not meaning to question you, but are you REALLY having it up on a stand (PS), running it at 1500 & taking the time needed?

The heat "suddenly stopped working" also leads to what could be a heater core plug.
Get a back flush kit & try that. Maybe $20 or so & it'll be usefull years on.

I'm not sure I buy suddenly. More like (like most've us) we didn't notice. <--- I have stocks in that! lol Ereerrrrr HAD stocks. Every odd or not normal sound I am tuned into now ;-)