It may not relate to the hg. You may just have air in there.
But something I have learned quite quickley after my build is this.
All the behaviors you are speaking of were for my car, pre-cursers to a BHG.
If your engine is tight. The cooling system really doesn't need to be burped and if you hear a small water fall noise.
It works it self out on it's own. I no longer have to baby sit it or watch for bubbles or any of that burping noise.
It's good that you aren't having any over heating issues.
Are you having any fluid or oil leaks from the engine.
Start with a complete coolant system flush. Top it off fully.
Put the front end up on ramps while you do this.
This will help keep the air bubble at a higher point in the engine.
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