If fan is running and very little air can be felt from your cabin vents, possibly a vacum line within the ducting may be malfunctioning, not allowing proper duct doors to open and/or close fully. On older GM models, (82 Olds Delta & 84 Caprise Classic) the HIGH mode for blower fan operated from it's own seperate vaccum line linked directly into the rear of intake manifold, or module on the throttle body. They sometimes melt or dry out and break. Check any lines coming from heater blower to their end destination.
Other thing to look at. Rodents often times build their little nests causing blockage issues. Up northeast, they like it inside a warm insulated area when goes below 0 outside.
Sunday, September 13th, 2009 AT 10:32 PM
