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Blend Door Problem
Your problem sounds like the common blend door problem on the Ford Expeditions, and Ford Explorer. The door is on a vertical axis and when it breaks, it can swing back and forth randomly giving heat or AC or nothing. The difference on acceleration is the force placed on the door swinging it one direction.
You can check the operation by fully opening the glove box, removing the actuator motor on top of the plenum box and examining the blend door axle (the actuator is under the unit on top of the hump behind the flexible black plastic cover. It is on top of the unit, behind the glove box in the 2002 F-350 though). Pictures of the common fail signature are available on the Related Links below. There are several "free" fixes that mostly are worth what you pay for them. The solution on the web site is solid and proven over hundreds of vehicles and will resolve the problem once and for all.
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∙ 14y ago
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1998 Mazda b2500and when you turn the heater buttom to make it blow cold air doesn't change and still on heat?
if youre trying to turn the heater on and cold air comes out, then its most likely the heater core
Why does heat in 1998 Dodge Grand Caravan blow cold?
Low Coolant? Bad thermostat? Heater core plugged or restricted? Heater core airbound? Heater control cable not working?
Why does the heat in your 2001 Ford Expedition blow cold air?
Low coolant? Bad thermostat? Heater core plugged, restricted or airbound? Bad heater control? Water pump not circulating coolant?
How will the heater react if the heater core is stopped up?
Your heater will blow cold air only.
Why would a house heater blow out cold air?
It doesn't really blow it out it just warms the cold air.
On a 1998 Chevy blazer what would cause the heater to blow cold air?
Check Antifreeze level..make sure there are no leaks under the vehicle.
Why does the heater blow heat while driving and cold at idle?
you need to replace your heater core
How can you tell if heater blower is not working?
it wont blow heat itll blow cold air
1999 ford expedition heater blows cold used to be able to get it to work by turning the fan switch back and forth several times not any more blow cold air?
The selector switch needs to be fixed or replaced.
Why does Kia Sorento heater blow cold air?
you are low on coolingliquid !
Why would you smell antifreeze and heater blow cold air?
heater core possibly plugged and leaking
On a 1998 Chevy Blazer what would cause the heater to blow hot air then cold and occasionally back to hot?
Either a faulty thermostat or you have a low coolant level.
