Seems that when I move my top heat lever to the left (from cold to hot) smoke comes out of the vents. It doesn't smell like burning plastic (i.e. electrical). In fact it doesn't seem to smell at all, but there is definitely smoke. Move the lever back to the cold position and it stops. Blower is off when this happens. It's just the air ebing forced through the vent as I drive. Do you suppose it's a bad heater core?
Thanks, John Nasta
