Fwd: Radio popping resolved-Now a slow leak inside the car when A/C runs

mike claire mike.claire at gmail.com
Sun Oct 12 18:41:04 PDT 2008

I have the same problem and I know the cowl area itself needs to drain and
can clog up with leaves and pine needles.  Mine's clear.  The evaporator
itself also drains to the same area just above the steering rack on the
passenger side.  Mine is clear. I pulled a plug at the top of the evaporator
and poured a quart of water in it and it all pours right out near the rack.

But when I wear sandals on a hot day with a/c on, every time I turn right my
foot gets soaked.  What am I missing

Whoops wrong list,  thought we were talking C4 S4s here.  This is the
200q20v list.  The evaporator probably drains the same way in both cars.  I
think they pretty much work the same so I'll let the question stand.


On Sun, Oct 12, 2008 at 8:02 PM, <kneale at knitknacks.com> wrote:

> It's your A/C evaporator box drains plugged.  There's a small tube that
> drops down on the passenger side of the area next to the transmission
> where the evaporator box drains.  Run something somewhat stiff like some
> weedwhacker cord or the core from an old speedometer up into the top of
> the tube.  You can't get all the way into the evap box because there are
> some plastic elbows in the tubing just outside the box.  If you remove the
> air temp sensor (under trapezoidal cover with wires attached on the top of
> the evaporator box) you can get to some of the coils and also pour in some
> water to see if the drain has been unplugged by the reaming.  While you're
> at it, this is a good time to also clean the main drain for the HVAC well
> the evap box sits in.  It's between the heater core box and the evaporator
> box down near the front of the well, close to the firewall.  It's a short
> rubber tube with a formed flat end at the outlet where water can drain but
> other things can't get back in.  I use a piece of wood dowel to push down
> into the drain gently and make sure there are no leaves/pine
> needles/acorns plugging it.
> >>     I noticed that when the a/c is running on max/high fan (in the
> >> summer), the carpet along the right-hand sidewall, front/driver's
> >> side would get wet.  Obviously something is leaking; the car had
> >> this problem years ago but I forgot what caused it, other than
> >> something was blocked.  I'm bringing the Audi in for a regular
> >> service on Monday and I'd like the tech to take care of the leak so
> >> I'm not reminded about this problem when the weather turns hot
> >> again, next year.  The mechanic is not an Audi specialist, but he's
> >> good and honest and if I can steer him in the right direction, he
> >> spends less time on the job.  Again appreciate the help.
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