ambient air pump: when is it turned on?

[edkellock at juno.com]

The asirator would only run on my V8 after the ingnition had been on
for a short while.  At first I thought I needed the engine running, but
then I realized it's on some sort of delay.  

My ran/runs fine, but I replaced it anyway with one from a '99 Cadillac
Seville.  It was not a direct replacement.  The casing is entirely
different,
it comes with its own temp sensor and there is a small circuit board in
it that lowers the speed of the fan to make sure it is not heard.  

I modified the casing, removed the circuit board, had to match up the
wiring, and figure a way to mount the hose to its end.  It finally went
in
very nicely and is quiet even though I got rid of the speed restriction
of
the circuit board by wiring the fan directly to the Audi wiring.

Ed
Colorado Springs

On Sat, 30 Jun 2001 16:11:02 -0400 Kneale Brownson
<knotnook at traverse.com> writes:
> I think the aspirator fan runs whenever the climate control system is 
> 
> on.  For sure, it runs when the requested temperature on the CC head 
> is 
> greater than the ambient outdoors temperature.  Once the temp 
> setting on 
> the CC head is reached, the aspirator fan MAY cycle (someone 
> suggested this 
> possibility in an earlier discussion wrt replacing the fans with a 
> GM 
> product to avoid the Audi $$$$$ pricing).
> 
> 
> 
> At 03:45 PM 06/30/2001 -0400, Konstantin Bogach wrote:
> 
> >Hi listers.
> >
> >When is that sucker on? How to verify that it good without taking 
> it out
> >and applying power directly?
> >
> >I will appreciate your prompt answer while this matter holds me 
> from
> >putting dash back.
> >
> >Speedo's needle fluctuation is fixed. Bad contact was in soldering 
> of
> >the 2 pin connector leg.
> >
> >Thank you.
> >Konstantin Bogach.
> 
> 
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