2004 Nissan Altima Q&A

2004 Nissan Altima Question: why does my heater blow cold air when my engine is idleing?

when i let off the gas my heater starts blowing cold air no matter when where or how it always does it -
Answer 1
ck coolant level 1st the poss sluggish blend door. scan codes and try blend doors with a scanner to make sure doors are operating properly -
Answer 2
possible blocked heater core -