ecu location?

[Tony Hoffman]

It should hold vacuum into the heater valve. There is a diaphram in it, and
if it's leaking that's what is bad. It should only hold vacuum into the
system under certain conditions. When the valve gets vacuum, it closes off
the coolant. However, when it's not getting vacuum, the passageway is opened
at the controler (in front of the glove box) so that the vacuum that was
holding the valve closed can be released. Otherwise, even after the source
of vacuum is removed teh vacuum in there would continue to hold the valve
closed.

However, I would check the line that feeds the cc, fromt eh engine. Also, it
sounds like one of the flap controlers or lines may be bad. There are
several in there, that go from the controler to the flaps. If you want to
check them, pull that controler down a bit to access the lines, and start
testing with the mityvac. You should be able to find where each goes by
color in the manual, but I'm not 100% sure about that. If it's not in the
200 manual, try the V8 manual.

HTH,
Tony

On Sat, Jan 22, 2011 at 12:58 AM, Ed Kellock <ekellock at gmail.com> wrote:

>  Thanks Tony.
>
> I found it and did my troubleshooting.  My email posted hours late because
> it was held by the spam filter or whatever.
>
> I'm investigating a hissing sound behind/under the dash toward the
> passenger side that I varies in intensity with boost level.
>
> I've tested everything with the Mityvac and the only thing that doesn't
> hold a vacuum is the heater valve and whatever it connects to on the other
> end.
>
> I tested the ecu hose right from the T off the intake manifold.
> I tested from that same point to the fuel pressure regulator.
> Under the plenum there's the white and black vacuum lines for the climate
> control.
>
> The white one appears to only control the heater valve and it would not
> hold a vacuum. Should it?
>
> Should it hold a vacuum going the other way, into the CC system?
>
> Thanks!
>
> Ed
>
>  -----Original Message-----
> *From:* Tony Hoffman [mailto:auditony at gmail.com]
> *Sent:* Friday, January 21, 2011 9:29 PM
> *To:* Ed Kellock
> *Cc:* 200q20v at audifans.com
> *Subject:* Re: ecu location?
>
>   Right side inside the kick panel. right in front of the door.
>
> Tony
>
> On Fri, Jan 21, 2011 at 4:20 PM, Ed Kellock <ed.kellock at gmail.com> wrote:
>
>> Where is the ECU in the 200q20v?
>>
>> Left side or right side passenger footwell?
>>
>> Ed
>>
>
>  No virus found in this incoming message.
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> 00:34:00
>