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'83 A/C vs fresh air
- To: email@example.com
- Subject: '83 A/C vs fresh air
- From: firstname.lastname@example.org (Robert D. Houk)
- Date: Fri, 12 Aug 94 10:20:15 EDT
- Reply-To: quattro
- Sender: quattro-owner
Well, at least part of my mystery (why vacuum servo has "locked" the
fresh air flap closed) is, well, not solved, but at least understood.
The old (i.e., '83) manual heat/AC three-lever control head does in
fact have a vacuum switch embedded in it. The whole unit, viewed from
Front, top left: Air lever for footwell control
right: Air lever for windshield control
bottom: AC / "off" / Heat temp control
Inside, lower left side: A/C microswitch, engaged by temp ctl to AC
(two connections, three wires)
upper left rear: A/C thermostat/clutch/gizmo (two wires plus
thermostatic piping connection to A/C coils)
lower right rear: Vacuum switch with two nipples
In addition, three wire/cable actuators, two on right and one on the
left (I think I got that right; cable on right goes to hot water valve
in engine compartment, the other two to control flaps on the air/vent
main assembly -- I was ***VERY*** careful not to disturb the cables
since I ***REALLY*** didn't want to take the control head apart to fix
what was still working before I took it apart...).
By carefully (tortuously) insinuating a small mirror through the maze
of cables, vacuum lines, wires (did I mention the stereo I just put in?),
and whatnot, I can see that what I thought was just a random protru-
berence is in fact one of the nipples, right next to it is a small hole
with rough edges where some ****er broke the other nipple off. Rather
than "fix" the problem, some previous bozon just hooked the two vacuum
lines together (permanently "wiring" the servo "on", recirculation mode
no fresh air).
I knew there was a reason why I don't like to buy used cars from people
I don't know and trust.
Time for an electric vacuum switch...wonder where I'll find one of
those guys? Something must exist that I can finagle into the system...