Coolant bubbles
 

I have bubbles in the coolant of my b16a1 when I take off the radiator cap. Now I havent noticed any coolant usage or white smoke, however I have removed the upper radiator hose a couple of times and never bled the system. Is it possible that the air is just comming out, or do I have a blown head gasket? It ran hot like a year ago, not extremely hot I shut it down when I saw it go into the red.

Re: Coolant bubbles
 

Well it's possible it's just trapped air being vented out when you open the cap. If you notice any oil mixed in with the coolant that would be a good indication that you have a blown gasket.

Re: Coolant bubbles
 

Id check your lines, and if they are fine, might be a head gasket... :-\