Checking coolant

[Dragonfly17]

Decided to check all fluid levels today and after a good long run left the engine to cool  for a good 10 15 mins before the checks , when checking the coolant I looked at the expansion tank it sat between min and max so I didn't bother opening the tank cap, I then opened the radiator cap slowly I could hear slight air noise and a little fluid dribbled out , I slowly put the cap back on and tightened it slowly my question is would I have to bleed the system ? how likely is it That air will have got trapped ? I know your supposed to check coolant when cold and it's fairly easy to cause problems by air locks 

[Krzys]

You should be fine mate. The system was still under pressure which is why you got the air noise.

 

If you had left it longer until it was stone cold, say before you use the car first time that day you wouldn't have had a problem opening the cap.

[Chandler]

if the temp gauge is fine, it blows hot air and theres fluid in the expansion tank your fine