heater only work at high revs & coolant light probs connected? help :/

Star2k8

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Hi, well annoying iv just got my new A3 and after a few days I saw the coolant level light come on topped up fluid went for a day them back and then my heaters just stopped getting warm then I noticed when I got high revs on motorways that vents blow the hot air there ment to then slow down and goes cold again, anyone heard of this!? Thanks
 
Coolant leak which is also letting air into the system causing an air lock?
 
I have the same problem, only passenger side heater works, but driver side still blows cold even though both is on HI. I have no coolant leak though.
 
I have the same problem, only passenger side heater works, but driver side still blows cold even though both is on HI. I have no coolant leak though.