Assuming you are going to replace the 99/04 Jeep Grand Cherokee blend doors yourself.
You would start by disconnecting the negative battery cable.
If you are going to remove the dashboard, etc to replace the blend doors.
some websites give you complete instructions with plenty of pictures.
It will take the average person with little or no auto repair skills approximately 12 to 16 hrs.
The vehicle will have to be taken to a shop that can recover the refrigerant before you start removing the dashboard and HVAC box..
If you are going to do the type of repair where you cut an access hole in the side of the HVAC box.
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 Blen Dor Store dual control kit
Replace the actuator motor.
Close the access hole - Replace the wall piece of plastic you cutout - I supply an aluminum tape to cover the groove made by cutting the wall.
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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Video's of the repair and expert support are available online. Check for a full explanation of the problem and repair process.
Again disconnect the negative battery cable first.
This type of repair takes an average of one hour to complete.
The work is done behind the glove box.
You would cut a 5" x 3" access hole.
Remove the broken plastic blend doors, etc
Install the new aluminum blend doors, drive connector with stop limited pin.
Replace the cutout section and apply an aluminum foil tape on the cut line.
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