What would you like to do?
For the 99/04 WJ Jeep Grand Cherokee there are two ways.
One is to remove the dashboard and HVAC box from the vehicle.
The other way to replace the blend doors is by cutting an access hole.
A short version of how the access hole repair is done.
Disconnect the Negative battery cable.
Lower the glove box - by hand
Remove the actuator motor - You will need a Phillips screw driver
Cut an access hole in the plastic HVAC box - I supply a multi-purpose cutting bit, you will need a rotary type of cutting tool, like a Dremel, RotoZip, etc. Or you could do the cutting by hand with any type of small cutting tool, it will just take longer doing it by hand. Or some customers used a narrow pointed soldering iron!
Remove the broken blend doors - by hand
Install the new aftermarket access hole blend door kit - easy, just slide the new doors in place - NO screws or other fasteners needed.
Close the access hole - Replace the wall piece of plastic you cutout - Apply an aluminum tape to cover the groove made by cutting the wall.
Replace the actuator motor.
Close the glove box - Your Done!
It is almost as easy as what you just read, the hardest and the most time consuming thing to do is cut the access hole.
The job should take between 30 minutes to 1 ½ hours. Depending on how long it takes you to gather your tools, etc.
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No. It is operated by an electric motor. But your problem may not be limited to the temp blend door motor. We also had problems with something in the heater box called a secon…dary stratification door. It works together with the blend door itself. Sometimes it would get warped and start hanging up. The solution is to replace the door with a revised door. It is also possible that you have an electrical problem in the heater blend door motor control circuit. Mix door The air mix door is malfunctioning or the controls are disconnected and allowing too much outside air to enter the cab. Sometimes you can get at the controls from the outside of the heater but you may have to open the heater to repair the mix door. Many times when cores are replaced the person forgets to reconnect the mix controls or breaks the connection unwittingly. The blend door actuator motor is on the front side of the box and can be seen by fulling opening the glove box and looking to the left over the transmission tunnel. Pictures and diagnostic procedures are available at heatertreater.net. The blend door on the Taurus is on a horizontal axis running from the front to back of the car. If you fully open the glove box, you can see the actuator motor in the far left hand side of the heater box. Access to the motor is trying, but not difficult. There is a metal cover held on with two screws and three additional screws that hold the motor in place. Additionally there is a miki-mauz lever system connected to the motor that controls the backside radiant heat door over the heater core. It is difficult to remove the lever system without breaking it. If you pull the motor, you can examine the axle connector to the blend door and physically verify if it is broken. The Taurus has two major problem. 1) a block heater core and 2) broken blend door. The dealer solution to replacing the door is complicated and expensive. It sounds like the control cable for the heater control valve may have slipped position, is now binding, or, that valve is partially blocked. Hopefully, the heater core needed replacing, and the heater control valve was'NT the problem all along. It is paramount that we find reputable and thorough mechanics. I'm not a mechanic, but I am a consumer who, like others, have been pinched before. Good luck on your thorough investigation !....BB On a 99 Taurus, the blend door is controlled by an electric motor and this same motor module is used on multiple Ford products. The motor has the characteristic of over stressing the plastic blend doors when it goes through a periodic calibration routine. The net effect is a broken blend door and loss of control over temperature control. We have the Taurus on our development list at HeaterTreater and will have a simple cheap solution available this summer. As a stopgap, you can short circuit the coolant flow through the heater core and run in AC only mode for the summer. The blend door actuator / motor is a rather common failure. Costs about $15, and the repair instructions can be found online (doesn't look too difficult with the ashtray & bracket removed) See "Related Links" below Nothing except normal plain old usage. They just fail. It is a motorized device built by human beings. It will and does go bad. There are plastic gears inside that wear out and electrical stuff that breaks down and dies. If you mean that you can't mix the air (i.e. make the air warmer and cooler with the mixer knob) it may not be the valve. My 99 stopped mixing about 6 months ago with 94,000 miles. Then a couple of weeks ago the "tee" for the heater bypass hose sprang a leak. I had the hose assembly replaced, but the car started overheating when the engine speed was low, as in traffic. We got it home from New Orleans to Jacksonville, FL by adding water every two or three hundred miles. I then came to this site and decided to have the water pump replaced. When I got back to the garage, he showed me the pump. THERE WERE NO VANES ON THE PUMP!!!!! It looked like a little waffle on a stick. Now I know why it would overheat - not a lot of water was circulating without any vanes. Try replacing the synchronizer assembly that is under the camshaft position sensor. I had to replace it in my 96 Taurus. I work in a repair shop and we have don't it in a 97 Taurus also.
How to remove the dash to fix a temperature blend door problem on a 1996-1999 Ford Taurus - Mercury Sable?
The temp blend door is not controlled by cable or vacuum. It is electric. I'd bet the farm that you have one of two problems. Either the heater core is stopped up due …to rust in the cooling system, or There is a problem with the blend door/blend door actuator. Either case, the dash has got to come out to fix. How big is the job? For somebody like me who has removed hundreds of those dashes, I can have it out in 45 minutes. Somebody who has never had one out, it could take all day. Disconnect the battery and wait five minutes to power down the airbags. Pull the steering column out.(make sure you lock the column and index the steering shaft, so you do not put it back together 360 degrees out and damage your airbag clockspring). Remove the trim down both windshield pillars, both ends of the dash, and kick panels. Remove the big trim piece running across the top of the dash below the windshield. There are three 7mm screws across the top of the dash, remove them. There are two 13mm bolts on each end of the dash under the end trim panels, remove them. Tug on the dash and see if there is any more bolts in the middle, but that should be it. Get some help, because as you pull the dash away from the firewall, there will be some electrical connectors at both ends you will have to disconnect as they become visible. There may also be one or two connectors in the middle. Here is something you may want to know to help you figure out what is wrong. There is not just one temp blend door in the box, but there are two that work together. One of them is called a secondary stratification door. Ford has had so much trouble with that secondary door warping and binding against the other door, causing heat and AC problems, that they have revised a new door to replace the old one. The part number is 3F1Z-19D842-AA just in case you get somebody at the Ford parts counter who doesn't have a clue.
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.
The blend door on my 1988 ford ranger is stuck in the cold position. any quick fixes or do i have to have it professionally fixed?
Answer . There is a mechanical lever on top of the heater that you can reach if you remove the plastic covers under the dash, just flip it to the other side.
IF the system is the same as the Mazda pickups and Mazda Navajo, HeaterTreater has a product that will fix the problem. Mazda diagrams are hard to come by. If you check …the pictures on the Ebay listing, you should be able to determine if the fix will work.
I'm not sure if Mercury followed Ford with the introduction of the new HVAC system in 2003. That is probably the case and the system and problems will be the same as t…he Ford Explorer. Pictures to identify which system you have and diagnostic processes are available on heatertreater.net.
The most common cause of your symptoms is blend-door failure. This is a design flaw created by Chrysler engineers. Basically what happens is that every 20 times the vehicle is… started, the A/C system software tells the blend doors to recalibrate to ensure that the airflow is as accurate as possible. The problem is that the stop point is made of cheap plastic. The stop point connected to the actuator breaks. Shortly thereafter, the blend doors break because they cannot withstand the pressure of the actuator pushing them beyont their limits after the stop point has been broken. Passenger side is typically affected first, followed by the driver side. If the doors fall with gravity into the down position, you will maintian A/C. If you hit a bump on the road and they fall into a mixed position, you will have neutral temperature. Either way, no heat is a symptom because that is the up position for Jeep Grand Cherokees (99-2004). I have tried this product, the Blen-Dor repair kit which will replace the plastic drive connector piece and the plastic blend doors with solid aircraft quality aluminum parts. Aluminum was chosen because it will be close to the weight of the original parts. The blend door shaft is a ½" solid piece of aluminum rod machined to fit. The two doors are aluminum sheet stock tig welded onto the door axle shaft with a foam covering applied to both sides of the door panels, all to make a one piece assembly. The second piece is the drive connector it is a ½" solid piece of aluminum rod with steel pins. The drive connector is machined to fit the actuator motor and to fit onto the end of blend door axle shaft assembly.
First, It only takes one nail and as far as I've seen the fix is only applicable to 92-02 Explorer, Ranger, Mountaineer, Mazda pickup. A full explanation of the fix and …pros and cons is available on the heatertreater.net web site in the Tech discussion area.
Can you fix a temperature blend door actuator motor in a 1999-2003 Windstar without taking out the radio?
Yes you can - most of the work then is done from just above the gas pedal. You'll also be using a 5/16ths ratchet / socket versus a nut driver. But I can tell you from exper…ience, it's a whole lot easier for someone not very good at being a contortionist to work through the radio opening.
Very difficult, as it is underneath the dash, which is hard to remove.
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 brea…ks, 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.
how do i replacement my blend door in my 1998 ford explorer
In Chevy Blazer
Probably won't be fixable, it is electronic. Replacement is necessary. Dash assembly must be removed to gain access to the temp blend actuator.
Its behind the radio/CD player. To service it, you must spend 3 hours taking everything apart to get to it.
There is no significant power at the three wire plug at the control knob, the three wires are directly wired to a potentiometer. In the five wire plug on the actuator there is… a ground and twelve volts. To test knob, use a multimeter to check for changes in resistance from the middle to the outsides, and for a constant resistance on the outsides. Use a voltmeter to check for 12 volts at the actuator plug, hooking to the two wires that are diff colors than the three that go to the control knob. If you have 0 volts with key in run position, you prolly have blown fuse. The knob resistance can be checked regardless of key position. If turning the knob varies the resistance, and you have twelve volts in run, then your actuator is probably bad. iF turning the knob yields no change in resistance, than the knob is slipping and not turning the shaft it sits on.
its when you take a door smash it up with your wiener, take another one, do the same, and put them in a blender.