[Shotimes] Blend Door Question

[Carl Prochilo]

Yup, one of my two SHOs suffered this problem.  A true PITA job.  The code
is '02" IIRC if you run the self-test.  You'll know it's busted if turning
on the AC will blow cold for a moment, and then goes to full hot.  Trying
to manipulate any of the AC controls for temp will result in no change.

Cheers,
Carl Prochilo
92 Ultra Red Crimson

> Jacob,
>
> In front of and above the passenger's toes is a black plastic housing
> called
> the heater box.  I will describe it from right to left, as the air flows
> through it from the cowl.  On the right side is the blower, a
> squirrel-cage
> fan that pushes air through the system.  Next is the AC evaporator.  After
> that is the blend door.  Behind the blend door is the heater core.  The
> blend door either opens (to let incoming air pass over the heater) or
> closes
> (to keep incoming air cool).  After that, air passes from the heater box
> into the center plenum, where a system of vacuum-operated dampers controls
> airflow to the defroster, dash vents, or floor.
>
> The blend-door MOTOR is mounted on top of the heater box, where the blend
> door pivots.  It's a black box about the size of a box of cigarettes.  Its
> job is to accept open/shut commands from the EATC head unit, and to report
> blend-door position back to EATC.  If the blend-door motor fails, you have
> to pull the dash to replace it.
>
> Run the EATC self-test (procedure is in Helms and probably on the FAQ).
> That test exercises the blend-door motor and BDM failure is one of the
> diagnostic codes that can result from the test.  Let us know.
>
> Joseph van Oss
>
>
> ----- Original Message -----
> Where exactly is the blend door located. I was in the dash the other day
> and I couldn't find it. I have a '94 in a local JY and I would love to
> get my A/C working. These 100+ days with my black leather interior is
> getting on my nerves.
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