Re: climate control replacement

[David Head <dave.head@worldnet.att.net>]

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/
> ///