well when im idling or stopped at a light if the heat is on like face or vetn,,, it gets cold like air conditioning air, then when i start driving again it gets hot again, weird if you ask me :S anyone know why this is? or anyone else ever experience any problems like that?

 

sounds like a coolant air pocket in your cooling system, rpms are lower at idle and this pocket can set in under your sensor, causing a shutdown reading, might try bleeding your system, if not then your heat door could be slammin shut cause vaccuum is highest at idle