hey there im having trouble. My friend has a 89 new yorker with a v6 that blows heat but not hot heat. blows heat better when sitting still. any clues?
which vacumn line runs the vents. she said that the heater only blows through the defrost and the floor.
Thanks for you help

a few things you can do; first, flush out your cooling system to make sure there's no corrosion or rust build up. Next, the direction of the air, could be a vacuum mode door stuck.