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No the blend door not functioning will not cause fog; it may however prevent the windows from being defogged or defrosted.
If the widows only fog up when the defroster is on, then you either have a coolant leak in the heater core or your air conditioner compressor isn't working (the AC is used to dry the air when the heat is on).
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What could be the cause for an automatic temperature control to stop working?
Blend door actuator failure.
If Heater blows cold air 1999 ford f150?
The most common cause of this failure is a broken blend door. Check heatertreater.net for diagnostic information and an inexpensive fix.
When the automatic temperature control is not maintaining the preset temperature A mechanical noise is heard in the area of the blend door What is the most likely cause?
The blend door is jammed
What is the most likely cause of a failure of all the power windows in a 94 Acura Vigor except the driver's?
Check the safety switch at the top of the driver's door control module. If on, it locks all windows except driver's.
What would cause air conditioner blower to work sometimes?
Start with: Possible control, blend door or blend door actuator, low pressure switch, leak in system.
How do you change blend door actuator on a dodge Dakota?
The blend door actuator on late model Dodge Durango and small pickup can be accessed by removing the glove box. There is a very common problem with blend door failure in these vehicles, and dash removal is required to perform the repair. A cheap and easy DIY fix for this can also be found at heatertreater. They also make a heater core regulator which bypasses the blend door and can remedy the situation with no dash removal.
How do you replace an AC Heater blend door unit on a 2004 Ford Freestar minivan?
Can't say for positive sure, but I would expect the Freestar/Monterey blend door actuator motor to be much like the Windstar. Common failure, easy replacement - about $40 See "Related Questions" below for links to the Windstar related blend door discussions
How do you repair the blend door in the heater on a 1999 Ford Windstar?
The blend door is vacuum controlled. Any vacuum leak in the engine system can cause the door to not function properly. Check this system first. The door could be physically sticking but a vacuum leak is a more common problem.
How to repair the blend door in the heater on a 2005 Ford Explorer?
I do not have heat in the car and the blend door clicks. How do I access the blend door in a 2005 Ford Explorer?
What would cause a 2000 Blazer not to change from ac to heat?
The most common problem causing a 2000 Blazer to stay on heat is a problem with the blend door. Check the blend door and its control circuit to fix the problem.
Where is the temperature blend motor actuator on a 2001 ford windstar?
The blend door actuator is located behind the glove box, and a sign of failure is an audible "clicking" sound when you adjust your climate controls. The most common issue with heat or A/C in the late model Ford windstar is a broken blend door. A broken blend door actuator is almost as common as a broken blend door itself. Typically, the fix requires disassembling the entire dash and replacing the whole plenum box, which can be a costly repair.This details the best DIY option on how to replace a broken blend door or actuator, accessing the plenum box by removing the glove box rather than the entire dash.
How do fix the heater on 98 ford windstar?
The most common problem with heat and a/c in the Ford Windstar is Blend Door failure. The Blend Door actuator on the Ford Windstar can be found by removing the glovebox. A broken blend door actuator is almost as common as a broken blend door itself. Typically, the fix requires disassembling the entire dash and replacing the whole plenum box, which can be a costly repair. Linked here is a video from www.heatertreater.net demonstrating how to access components of the plenum box for repair without disassembling the entire dash.
