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Caddy A/C programmer...
Last Saturday I went out to my local boneyard to examine an A/C
programmer used in Caddys. Results are mixed. The caddy unit (82 -90?)
Caddys with digital air conditioning use a programmer with some
similarities to my '87 Audi 5K CST. The units are not interchangeable.
The GM unit carries a part number of 16050746. It mounts in an
'upright' postition, with the motor shaft at the top and the vacuum
inlets at the bottom, electrical connections at bottom left. Motor
looks identical, and carries a part number of 16050730. Arm is
different; the GM version connects to a metal rod to actuate whatever
it moves rather than a cable. Arm needs modification, or swap Audi arm
onto the GM motor.
Board is very different, having 3 solenoids instead of 4. One of the
GM solenoids has 3 vacuum lines; I would guess it is doing the duty of
the 4th Audi solenoid. Lots more components on the GM board. Vacuum
connector is different as well, mechanically, and uses all vacuum
connections. 2 of the solenoids look interchangeable with the Audi
units. Only difference I can see is on the top, the GM units have a
filter screen, the Audi has the same filter, but with a metal plate
(with holes in it) above the filter material.
So, for my $25, I have parts...motor and 2 solenoids that should work
on the Audi programmer. Since my current motor has a stripped gear,
the motor alone may be worth the $25.00. (I didn't price a replacement
before I got the GM box.)
What will the great Audi God do if I start putting Caddy parts in my
Prices for used Audi programmers seems to be stable at $125.00.
Rebuilt units at $170.00 and up, more or less, plus the core charge.
The GM boxes might be a good source for parts if you are inclined to
service your own A/C programmer.
For any of you who might be rushing out to your local GM boneyard...
Take a shortie Phillips screwdriver to remove glove compartment box
screws. A 9/32 nut driver fits the programmer mounting screws. Having
a short shaft driver helps, but with careful positioning, the long
driver bit works fine. Easier than removing the Audi box! The same nut
driver fits the vacuum connection retaining nut. A flat screwdriver is
handy for releasing the electrical connector from the box, and popping
the actuating rod out of the motor arm.
I was quoted prices from $25 to $65 for this box, so check around
before you leave home.
Getting to know more about A/C than I wanted...