This problem just started a couple days ago.
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1999 Ford Windstar Question: Heater blows out cold air this started 2 days ago.Is it the thermostat.
Answer #1Pay it forward February 12, 2012, 16:09Enthusiast
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.
Answer #2davecallans February 12, 2012, 21:10Technician
A leak any where in the coolant system could cause an air pocket in the heatern core.
Answer #3Judes November 28, 2012, 10:28Rookie
The fan is broken