1999 Ford Windstar Q&A
1999 Ford Windstar Question: Heater blows out cold air this started 2 days ago.Is it the thermostat.
If it don't run hot,it's not the thermostat.Check the water level in the radiator and if that don't work then the heater core is stopped up. - Pay it forward
A leak any where in the coolant system could cause an air pocket in the heatern core. - davecallans
The fan is broken - Judes