I have noticed recently a blast of cold air blowing from behind my heater box into my passenger side floor. But it blows semi-warm air out all vents but there seem to be some lack of force behind it. I have no clue whats is wrong???. My uncle suggested the blower was running backwards, But I havent touched anything or messed with it in over a year when I changed the heater core
It's an 89 LX