you need to check the blend door
A more common problem is the actuator motor that controls the door itself.
A quick and easy, and not too expensive of a repair.
See "Related Questions" below for much more about diagnosing no-heat problems on Windstars.
my 2001 ford windstar is still overheating even though i changed out the thermostat. what could it be?
Could be the head gasket. Very common problem with this engine and model year Windstar.
2000 Pontiac grand am se keeps over heating I changed the water pump, the thermostat, radiator cap, head, and it is still over heating. make sure thermostat is going the right way , spring gose to the motor
IF YOUR CAR IS HEATING UP(OVERHEATING) AND YOU STILL DRIVING IT, A FAULTY THERMOSTAT IS THE LEAST OF YOUR PROBLEM.
Yes, If the thermostat isn't working, It cant tell the heat to come on. Thermostat is the brain of a heating & cooling system. Most likely the thermostat itself has worn out and does need to be replaced. You can get another digital one or you can change to an older style if you so desire.
check the fan clutch
A thermostat is one cause of over heating engines.The "Related Question" below lists a few other suspects to investigate that can also contribute to overheating.
check the water pump
Coolant leak, plugged radiator, failed water pump, inoperative fan.
The heat may still be on even though the thermostat is off due to a malfunction in the thermostat, a wiring issue, or a problem with the heating system itself. It is important to troubleshoot and address the issue promptly to prevent energy waste and potential safety hazards.
heater core....
If you are unsure if it is heating because of a water pump or a thermstat, you can find out by removing the thermostat. If it still heats without a thermostat, then you know it is the water pump. Without a thermostat, the water flow has nothing to cause it to heat unless the water pump fails to circulate the water. No circulation of the water would cause the over heating.