[200q20v] HEATER: Sheeza HOT, Sheeza COLD...

[Kneale Brownson]

--
I think the flap referred to would be in the heater core box.  The other
flap and A/C evaporator box area drain results in foggy windows, not
variable heating.

Wet REAR footwells, I've found, are from plugged sunroof drains.  There are
four drains, one from each corner of the sunroof opening.  The front two
empty into their respective front door jambs.  The rears come out just
behind the wheelwells.  Audi suggests reaming 'em out with a flexible steel
like a long speedometer cable.

Somewhere in the archives are descriptions of problems related to the heat
controller.   I think what happens is whatever it is that operates the
flaps in the heater core box that lets heated air into the cabin is
controlled by vacuum motors and the vacuum motors "lose their grip" when
something like accelerating changes the car's overall vacuum pressure, and
then it takes the sensors a while to catch up with the change in air
temperature.  There's a fair amount of information in Scott Mockry's
website:  http://www.sjmautotechnik.com/


At 06:18 PM 12/23/2001 -0500, Martin, Gary G wrote:

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>Well, I guess I'll answer my own question. After checking Chris Miller's web
>site and perusing the Bentley, all indications point to temp regulating flap
>and/or motor. Guess I'll have to check the water drain in there also. Today,
>while cleaning the car, I found wet rear footwells. Strange thing is, the
>front ones were dry. Is this A/C drain the culprit, or is there another
>cause?
>
>Gary
>
>-----Original Message-----
>From: Gary Martin [mailto:motogo1 at home.com]
>Sent: Sunday, December 23, 2001 10:07 AM
>To: Audi 200
>Subject: Re: [200q20v] HEATER: Sheeza HOT, Sheeza COLD...
>
>
>Don't think so. Coolant temp looks normal. Heat cycles happen all the time,
>consistently. I'm thinking maybe some flap isn't flappin' correctly.
>
>Gary
>----- Original Message -----
>From: "Brett Dikeman" <brett at cloud9.net>
>To: "Gary Martin" <motogo1 at home.com>; "Audi 200" <200q20v at audifans.com>
>Sent: Saturday, December 22, 2001 11:15 PM
>Subject: Re: [200q20v] HEATER: Sheeza HOT, Sheeza COLD...
>
>
> >
> > Here's a thought...engine thermostat stuck open?  Here's why...if it
> > is, coolant will be quite cool at any decent speed when it's cold
> > out, until you start to go up a hill, and the coolant jumps in temp.
> >
> > Do you remember off-hand if the heat cycles were when you were going
> > uphill/accelerating?  Where was the coolant gauge during this?  Did
> > cranking it up to "HI" change the behavior?
> >
> > Also note that "bilev" puts out cooler air from the dash than it does
> > from other vents.
> >
> > B
> > --
> > ----
> > "They that give up essential liberty to obtain temporary
> > safety deserve neither liberty nor safety." - Ben Franklin
> > http://www.users.cloud9.net/~brett/
> > http://www.users.cloud9.net/~brett/bdikeman.asc (PGP Public Key)
>
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