My 2006 Chevy Impala has some heating/cooling screwups.
When I am driving it puts out hot air, but if I stop at a red light or put it in park, it blows cold air.
Any suggestions on how to fix it or what it could be?

 

Take it back to the dealer it is under warrenty

 

Check your coolant level. I had the same problem and it worked after finding my coolant was low and i fill ed back up.

06 ls