0
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.
Wiki User
∙ 14y ago
Add your answer:
Earn +20 pts
How do you close the blend door on a 2004 S-10 Blazer 4.3?
The blend door is electrically operated and the only way I know of to access it is to remove the dash board assembly.
Where is the location of the blend door actuator on a 2002 gmc Yukon Denali?
need to know were the blend door actuator is for a 2002 gmc yukon on the drivers side , dual climate controls, rear air and heat
Which operating system can function correctly with 64MB of ram?
None, as far as I know, possibly MS-DOS, I know FreeNAS can be run from a 32MB, but it's a server Operating system.
How do you buy 2003 ford windstar blend door actuator?
Just give info to the auto parts store. They should know what it is. If not the dealer will know.
If the blend door actuator is ok what other part can fail on the heater on the 2000 ford windstar?
There's the heater core itself - getting plugged upAnd then there's the blend door itself - they've been know to get stuck and/or break.See "Related Questions" below for more
Where is located blend door motor in 1999 dodge durango?
On the bottom of the heater/ac assembly in front of the passenger compartment . YOU KNOW BEHIND THE DASH .
How do I know if I replaced a thermostat on a 1998 Subaru Legacy correctly?
There wont be any leaks, the car wont overheat and it will stay in the normal operating temperatures.
Where is the blend air door actuator drive circuit on the jeep grand Cherokee limited 1997?
The HVAC system is all under computer control and there is little or no stand alone circuitry. The most common fail with the system is a broken blend door. The computer will detect a fail condition and go into "hibernation" because it doesn't know how to deal with failure. Replacing the blend door will bring the system back to life. Check the information on heatertreater.net for diagnostic information and a repair procedure.
Why do cake decorators have to know how to blend colors?
so they can blend the colors
How do you know if you have a bad blend door actuator or a bad control?
You can try replacing the batteries to see if that helps. If not you may need to get a replacement or see if the power it working properly.
How does a blend door work?
A blend door is short for Blend Air Door. There are other names such as temperature door, etc.. The blend door, blends or mixes the hot air with the cold air. There usually is an actuator motor that opens and closes the blend door a little at a time to adjust how much hot air and cold air to mix for the temperature setting you have chosen. If your blend door or doors are broken sometimes you will only get cold air coming thru the vents or maybe just hot air with no air conditioning. For more information on the fault codes, etc for the Jeep Grand Cherokee blend door problems, checkout the Blen Dor Store on Ebay. There is an easy blend door replacement kit with only two parts to install. No Dashboard Removal. The Blen Dor kit is guaranteed for as long as you own the vehicle. For more information try a search for Blen Dor . Close, but not exactly. On most modern vehicles, air is constantly blown through the AC evaporator core and then the blend door can divert some or all of the air through the heater core. In full AC mode, the blend door is closed against the heater core inlet and all air flows around the heater core and directly into the vent system. In heater mode, the compressor is deactivated and the air flowing through the evaporator core has no temperature change. As before, the blend door will now direct some or all of the air flow through the heater core and into the vent system. In the old days, the blend door was controlled by a slide lever on the AC panel which was connected to a cable that ran to the blend door. In the mid 90's most automotive companies went to computer control over the blend door, using a pseudo stepper motor to control the door. A common design flaw in these systems is the end point detection for door movement. For a computer algorithm to control the door, it has to "know" when the door is closed against the heater core or blocking the free flow of air through the vent system. This is done by driving the motor and door to a stall point and detecting a voltage surge from the motor as a digital signal indicating the end extent of movement. The catch is that over time the plastic doors cannot withstand the over-stress of the calibration routine and will break. When this happens, all control over heat and AC is lost. The problem is common on multiple vehicles and HeaterTreater has built a line of products for the most severe cases. We are always looking for additional applications for our repair technology and would be happy to discuss how we can provide a solution for your particular issue.
