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If there is, or has been a bumping noise coming from behind the radio when changing the temperature setting, it is likely the blend door actuator has failed.
There is a Related Question linked below that provides detailed information on replacing this part yourself.
If it's not the actuator motor, the actual blend door may be broken. This is a very common problem in the Windstars. Typically the dash must be disassembled and the plenum box removed to access the blend door. I tried another method with the heatertreater. It involved removing the glovebox and making an incision in the plenum box to replace the blend door. It saves a lot of time, check your actuator motor to see if it has the stripped gear issue first
Read more: How_do_you_fix_the_heater_in_a_2000_Ford_Windstar_if_it_gives_no_heat_just_cold_air
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What is the cause of a 98 Ford Windstar overheating but heater only blows cold air?
thermostat stuck
Why is the heater in my 99 ford windstar only blowing cold air?
The most common reason the heater is blows cold air on a 1999 Ford Winstar is a bad thermostat or blocked heater core.
98 ford Windstar heater blows cold at red lights and you get going heats up again?
Check your coolant level. It may be critically low.
How come your heater blows cold air in a 2000 silverado?
The heater might blow cold air in a 2000 Silverado because the thermostat is sticking and not changing from cold to heat. The thermostat is usually located in a hose that leads from the radiator to the motor.
1996 vw sharan heater blows cold cabin hot?
can you please clarify what you mean, do you mean that the front heater blows cold but the rear blows hot or do you mean that when the heating is on cold it blows hot? many thanks paul
1999-2003 Windstar with no heat - or cannot adjust temperature - just blows cold air?
you need a new heater door actuator motor about 50 dollars from ford.For a comprehensive review of Windstar "no heat" problems, see "Related Questions" below for more
If the heater works but blows cold air and heater core is good what do i check next?
Get the air out of your heater core.
Ac works but heater blows cold air?
heater hoses might have been disconected
Why would your heat only work on defrost?
ihave a 1986 chevette that when i turn defrost on it blows out heat and when i put heater on it blows out only cold air? ihave a 1986 chevette that when i turn defrost on it blows out heat and when i put heater on it blows out only cold air?
Your heater in your jeep only blows cold air why is this?
The most common reason a automobile heater blows cold air is the water level is low. Check the water level and fill to the appropriate level.
Heater problems on ford 1999 expedition?
the heater blows warm air when fan is on low but blows cold air when fan is turn to higher setting
Why does Heater blows cold air on 2001 blazer?
you must have low coolant or a bad heater core
