My heater only blows hot when the car is in motion after about 10 minutes. When I'm in traffic, or stationary, the heater starts blowing cold air again. Does anyone know what the problem may be? busted heater core? clogged?

 

Check your antifreeze level,maybe low...

 

newbie mistake, I searched the forum and others have had the same issue, thanks for your help! I'll check my antifreeze today