Blend Door Actuator Arm
interior heat on the 1997 to 1998 Lincoln Mark VIII is a
common problem. The problem is a part that Ford calls
A/C Electric Blend Door Actuator ( FZLZ-19E616-AD) that
costs only about $25, but requires over 6 hours of labor
to replace. The cost to install this part at a dealer is
$600 to $900. It would be far better to make the part so
it does not break so easily. The part nearly always
breaks at the actuator arm shaft shown below.
courtesy or Randy "goalie" Hall.
This article describes a simple procedure to reinforce
the piece at its weakest point. Apparently the part has
been improved by Ford over what was original equipment
on the cars. The original part number on the motor
assembly was F7LH-19E694-AE. It is now F7LH-19E694-AF.
On the part with the AE extension the black arm can be
pulled off the shaft, on the newer part with the AF
extension don't even try to pry it off. You will break
the arm, as LOD member Mark Hannah discovered.
We will reinforce
the weak points of the assembly from the outside and the
inside as follows:
First wrap the
base of the black arm shaft tightly with wire. Twist the
ends of the wire and snip off the ends close to the
base. Make sure the ends do not protrude outwards as to
cause interference. Coat the wire with fresh mixed epoxy
to hold it in place.
Choose a nail
that can go most of the length of the common hole
through the white pinion gear shaft and the the black
arm shaft. The common hole is at the bottom of the
square hole on the motor pinion shown above. I used a
common 2-inch finishing nail.
Coat the nail
with fresh epoxy that you mixed up. Do not worry about
filling the square hole, as it is not functional in the
Mark VIII application. Push the nail into the common
nail to push the head of the epoxied nail into the
bottom of the square hole.
If you are
curious, these are the internals of Blend Door Actuator
Article by Alexander Sosiak. Thanks from input from
everyone on the LOD message board, especially Mark
Hannah, Randy Hall, Jason Zerbini and Don Koleff. Let me
know if I forgot anyone.