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Thanks and a plea for more help.
This is a continuing thread about the air conditioner in my
865k. I have receieved many suggestions, but I would
reallly like to talk directly with someone who has a bentley
manual and wouldn't mind spending a few minutes with me. If
someone is willing to spend some time on the phone, could he
or she drop me an email and I will send back my home 800
phone number. I don't want the world to see it as there are
some spammers out there that I'd just not call me and make
it worse by my paying for the call.
I've had lots of ideas from many list users. This group is
great. Once I get the air working on my 86 5000, I'll post
a question about my 92 100CS. In the meantime, I know lots
of stuff that is not the cause of my non functioning air
conditioner. I am ready to get creative.
My thought was that pin 8 from the AC control head is
supposed to get to that relay by a round about route through
some sensors and stuff. (This is per the guy from
Autosport). Actually tracing the wire path through
connectors etc. would be a nightmare so I am thinking of
running a wire directly to the relay. Before I do this, I
need to know if pin 8 specifically goes to relay 11, coil
side. Relay 11 is the one under the hood in the fuse box
and referenced on the lid as "air conditioner relay".
Snce I get confused about terminology, I also need to verify
that the contol head is really the unit in the console with
the auto, warmer, cooler buttons and digital read out as
opposed to the gizmo box with hoses under and behind the
One thing I should note is that when I meter the relay
socket with the relay out, ignition on and doing an on-off
of the air, I see a small change in the resistance to
ground. I would expect it to drop to ground, completing a
path for 12V through the coil. That is not happening.
This leads me to believe a transistor somewhere on the
control head might not be turning on. I remember this from
many years ago in an electronics class. I suppose i could
go to radio shack and replace all the common transistors on
the board, hoping to get the one that makes it work. That
seems drastic though and I might cause other problems. An
board schematic would be real nice to have too.
What I can't accept is that there might be two problems.
>From a earlier suggestion, I know the temperature sensor is
kaput. Coolant was seeping through it and the wires were
corroded off. I haven't replaced it yet, but plan to. I
don';t know if the relay path goes through here or not. I
wish I knew difinitively the exact wire path for the signal
from the control unit to the relay.
If anyone is reading this during the day and have the bently
with you an alternative number would be 800-968-7500 (dial 1
for an extension, mine is 7802) this is my work #.
Thanks in advance.