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Re: [T3] Aux. air device (AAD) for automatics

On 15 Feb 2005 at 18:30, Toby Erkson wrote:

> Okay, how does this damn thing work?

It's the Aux. Air Regulator (AAR)

It's a temperature sensitive valve: Open when cold, closed when warm. It has a 
built in electric heater to warm it up.

> My hoses are connected correctly.  There is a red wire attached to the 
> bottom of it -- good, as that's what the automatic model is supposed to 
> have.

The red wire should have 12V on it any time the fuel pump is running. The other 
end of that wire goes to the fuel pump relay. Make sure it's actually connected 
there, and connected in a way that gives the proper end result.

> I can completely close the idle bypass...nothing happens to the engine 
> idle.  If I open up the idle bypass the rpm increase.
> If I clamp off the hose from the air cleaner to the AAD (or pull off the 
> hose and seal it with my thumb).  The engine dies.

Sounds like all the idle air is coming in thru the AAR

> This is with the engine cold as well as warmed up.  What gives?  How is 
> it supposed to work and how does one test it?  I'm thinking that once 
> the engine is warmed up the AAD would close, no longer allowing air to pass.

Sounds like it isn't closing. Make sure the 12V is there. Or the valve could 
just be sticky. If it's stuck and stays that way thru several warmup cycles, 
try putting several drops of oil down its throat. Otherwise, you can't take 
them apart without destroying them.

If it has power and yet still doesn't heat up, then the heating element may be 
opened up. You could try to measure its resistance. I don't recall what it is 
supposed to be, but it is probably somewhere between 10 and 30 Ohms.

Jim Adney, jadney@vwtype3.org
Madison, Wisconsin, USA

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