Thread: Bad gaskets?

How about the coupler noise--how urgent is this to change? It is not that loud, but kind of sounds like a tumbler type noise (maybe like a dryer) or maybe like rocks rolling around in something. I am very particular and anal about my cars so I want to stress that the noise is not very loud or noticeable. Other people I have had listen to it did not hear it. Does this sound like a coupler, and it this something that will last a while before causing any damage, or should I get this done soon?

Also curious about the cooling system bleed process. I have searched and all I seem to find are quick posts with half information such as open the bleed valve with the heater running. I have done this and have continued to crack it quickly each day after driving home from work, but based on my gauge fluctuations it seems I still have a little pocket of air. Should this process be done with the radiator cap off? My bleed valve does not seem to be putting out any air or bubbles, so I am not sure how to get the rest of the air out or whether I should be adding coolant somewhere as I go. Am I missing a step?