I think I still got air in my Cooling system. I changed my coolant b4, I heard some water flowing noise when engine is cold, so I parked at a not so steep hill, Warm the engine up, While the engine is running I keep pouring Coolant and it went pass a little bit of F mark. Closed the cap ...

The water flowing noise has been reduced by maybe 90% but still a bit left.

Should I find a *very steep hill* and try the same thing again ? (park, warm up, let it running add Coolant)

(Its really a pain to bleed the cooling system for this car, my Father's mini van, psssst, I just need to open 2 valve and I can bleed the whole thing easily (in less than 1/2 hour of time, including complete coolant change/flush)

Thx