2006 mazda 6

Blows cold air at idle.

While driving it blows warm. I was told it was low on coolant so i added some and it still blows cold at idle. So it could be air in system or blown headgasket. Already bought another car and dont have time or need to fix this one.

Anyways tires are decent and it runs and drives nice. A/C has worked with a recharge each summer and tires are decent. I have the title

Text me 7o1-201-0628