Work through the coolant bleeding procedures - it may take a time or two to effectively remove all air from the system.
See "Related Questions" below for more
no no
have the heater core cehecked out
Once a heater core starts to leak, the only remedy is to replace it.Luckily it appears to be a pretty straight-forward job on the Windstar - the heater core is at the bottom of the center of the dashboard - remove the ductwork and some of the trim pieces to expose the heater core compartment.Of course, this is after draining the engine coolant and disconnecting the heater hoses in the engine compartment.See "Related Questions" below for more...
Heater core may be air bound and have to be bled Heater core may be plugged or restricted Thermostat may not be opening allowing coolant flow to core
Need the correct model of vehicle you have and you cannot repair a heater core...........
Suspect a plugged up heater core then.See "Related Questions" below for more
Feel the heater hoses in engine compartment if one is hot and other cool try flushing heater core.
The heater problem in a 2000 Ford Windstar is often related to issues with the heater core, thermostat, or the cooling system. Common symptoms include insufficient heat or no heat at all, which may be due to a clogged heater core or a malfunctioning thermostat. Additionally, a coolant leak can affect the heater's performance. Regular maintenance and timely repairs can help address these issues and ensure proper heating functionality.
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.
The most common reason the heater is blows cold air on a 1999 Ford Winstar is a bad thermostat or blocked heater core.
In addition to the front core in the dash, if the van has the optional rear climate controls there will be a second one back there.See "Related Questions" below for lots more about Windstar heater cores and climate controls
The heater core is usually your last resort. So now start from the end to the beginning, core, thermostat, flush, hose, fluids. Follow the trail and your bound to find your answer.