air bubbles entering coolent
 

well like the title says i got air bubles in my coolent.
im replacing the thermostat gasket tomorrow morning so we'll see how that works out.
the coolent is just going to the overflow tank for now and im siphoning it out about 2 times a day to prevent spilling this stuff on the roads so its not costing me money right now.
i was thinking it could be a hairline fracture in my rotor housing or maybe a crack in my rotor housing gasket.
but im hoping it was the thermosstat gasket that really wasent there, only a layer of gelatinus green stuff.
so if you have any ideas im open to them.

Also check the pressure cap. And the rubber line from the pressure cap to the overflow.

If you want to find out if there is an internal leak, just do the bubble test. With the engine dead cold, remove the coolant filler cap. Start the car. Do you see a steady stream of bubbles from inside the engine? Rev the engine using the throttle body. Do the bubbles increase significantly? If so, then you are probably looking at a failed coolant o-ring or a cracked iron (S4 issue mostly).

so how would the rubber line from the pressure cap to the overflow effect anything?
and i checked the pressure cap its still got alot of resistance left in it.
and when i drive it for about 10 min i have air pressure, like steam coming from it.
but ill do the bubble test tomorow morning and get back to you