First change out the themostat. If problem persists , it most likely is the water pump. Too much clearance around the impeller causes slow water movement and does not circulate to the heater core properly.
follow the upper radiator hose, that should lead you to it.
valve cover gaskets valve cover gaskets
That would be the 4L60E transmission
Check for vacuum leak or bad vacuum motor Check selector control
6,600 lbshttp://autos.aol.com/cars-Chevrolet-Tahoe-2000-Z71__4dr_4x4/specs
Yes, I have a 2000 Tahoe and it has a removable third row.
it is a heater. heat. it blows heat. warm air
I would check all fuses, then work my way back. Sounds like a fuel filter or fuel pump to me.
schematic on cabin air filter for a 2000 chevy tahoe 5.7 L
A blocked heater hose could cause a leak. A stopped up heater core could as well. Or the connector in the Windstar could be cracked.
A replacement heater core would cost aprox $35.
6x139.7