Lincoln Mark LT '06-'08
HeaterTreater kit for blend door repair on the Lincoln Mark LT '06-'08. This kit will replace the door and restore heat and AC to the truck. This repair is medium difficulty and well within the capability of shade tree mechanics.
Do you have the problem?
The usual symptom is an inability to effectively control the temperature in your car. Note that this symptom can also be caused by a bad temperature control knob, and this is a common failure on Ford trucks.
The blend door hangs on a vertical axis, so turning a sharp corner or turning up the fan to “blow the door shut” can swing the door into the hot or cold position randomly. While the symptoms are fairly conclusive for blend door failure, the only way to really check it out is to remove the blend door actuator motor and look at the axle. The actuator motor is on the top of the plenum box and extends through the bottom of the box and you can find the bottom of the axle and feel the movement when you change temperature. If you want to really check closely, you can cut a “peephole” in the box and see/feel the movement of the door. Cut a small square section that will be easy to patch with some sheet metal and epoxy.
- All work is done through the glove box and radio opening and no disassembly of the dash or evacuation of the AC system is required.
- Tools required are a screw driver, pair of pliers, and a Dremel tool. You can also use a hot knife(soldering iron with blade attachment). This makes less mess, but is slow.
- Includes detailed instructions and all hardware required to complete the fix, including dremel bits and metal tape to seal the cut.
- The repair will take about an 90 minutes the first time, and once you have experience, about 45 minutes.
- No extensive mechanical skills are required.
- The instructions are dual-level, for mechanics and a “Instructions for Dummies” version.
- The fix is relatively easy and MUCH preferable to disassembly of the entire dash and engine cooling systems.
- We provide customer support via email or phone as required.
The following video demonstrates the Heater Treater installation process. Note that this is a sample application and your dash/access may vary slightly,
Full instructions with pictures are included with the kit, so between the instructions and the video, the job should go fairly smoothly. From some of our customers comments, the hardest part is getting up the nerve to make the first cut into the box. Once you’ve made the commitment, the fix goes smoothly. If you ever have a reason to do a second repair, it will be very easy.
The motor on this model is on top and difficult to get to and check. The video below shows the location and access. Ford didn’t make any design provision for ease of access, so there is a little work to get to it and the connection is recessed in the box and hard to check. The motor is a two wire DC motor and you can use a 9V radio battery and snap connector to check the motor by contacting the two outside pins on the connector,
The HeaterTreater kit will replace the weak plastic doors with metal components. The system will operate just as new, only longer life and reliability and better sealing with the improved foam used on the door. The repair will outlast the vehicle and save money over the dealer repair.
The video shows a Ford F150 installation, but the plenum box and repair are the same on the Mark LT.