Re: climate control replacement

[ti@amb.org (Ti Kan)]

I went and checked again, and found the following:

On 84 and 85 type 44 cars with the older style GM CC control head, the rear
defog button is on the CC control panel.  On the 86 and later cars, there is
a separate switch.  Sorry for making a blanket statement before verifying.

The old style vs. the new style type 44 CC control head look almost
identical, but can be identified by differences in the row of pushbuttons.
The early version has OFF, ECON, LO, AUTO, HI, front DEFOG and rear DEFOG.
The later version has OFF, ECON, BI-LEV, AUTO, front DEFOG, LO, HI.

On all type 44s, the *front* window defog button is on the CC head panel.

At any rate, the relay location I described is still valid.

As to Stephane's 86, I don't know why it's got the rear defog button
on the CC panel.  Either Stephane got it confused with the front defog
button, or his car has an older style CC head.

-Ti
96 A4 2.8 quattro
84 5000S 2.1 turbo
80 4000 2.0
-- 
    ///  Ti Kan                Vorsprung durch Technik
   ///   AMB Research Laboratories, Sunnyvale, CA. USA
  ///    ti@amb.org
 //////  http://metalab.unc.edu/tkan/
///



David Head writes:
> Hmmm - My defogger on the 89 and 87 type 44 -  switch is on the dash, same row as
> ABS/Seat Htrs. Operates rear window and door mirrors heaters. Has nothing to do
> with the GM CC. Defroster is on the CC.
> 
> Ti Kan wrote:
> 
> > Fred Munro writes:
> > > Hmm, interesting, Stephane. These defrost circuits pull a lot of power, so
> > > there may be a relay somewhere. The switches on a climate control unit are
> > > not usually very heavy duty. I've never seen a rear window defrost switch in
> > > the CC head - my '86 5ktq had the switch on the dash from what I recall.
> >
> > Fred, you must have forgotten, then.  All North American 84 and later
> > type 44 cars with the GM-sourced climate control have the rear
> > window defogger switch on the climate control panel.  However, you
> > are right in that the defogger is a heavy current consumer and there
> > is a separate relay that activates it.  The switch on the CC is merely
> > a momentary touch button that tells the CC head to activate/deactivate
> > said relay.  On most type 44s (except the 1984 non-turbo) this relay
> > is on the auxiliary relay panel under the dash, the rightmost one on
> > the bottom row,  This panel is accessible via the little door under the
> > dash.
> >
> > On the 92 and later style climate controls (such as on your S4), the
> > rear window defogger switch is a separate switch on the center console.
> >
> > -Ti
> > 96 A4 2.8 quattro
> > 84 5000S 2.1 turbo
> > 80 4000 2.0
> > --
> >     ///  Ti Kan                Vorsprung durch Technik
> >    ///   AMB Research Laboratories, Sunnyvale, CA. USA
> >   ///    ti@amb.org
> >  //////  http://metalab.unc.edu/tkan/
> > ///
> 
>