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Re: [T3] Aux. air device (AAD) (was just for autos)

On 15 Feb 2005 at 20:44, James Montebello wrote:

> OK, so I'm familiar with a couple of the AAR devices
> seen on some D-Jet and lots of L-Jet cars, but I've
> never seen one like the one on my new-to-me '69 MT
> Square.  It's just a nub with what the manual says is
> a temp sensor stuck on the case near the distributor. 

For '68-9 the temp sensor replaces one of the AAR studs and sticks down into 
the case. Thus, both it and the AAR respond to engine oil temp. That temp 
sensor was moved up to the intake air distributor in '70 and responds to intake 
air temp thereafter.

> The manual is non-too-detailed on this thing, and mine doesn't appear to
> work.  It appears to be stuck open, as pinching off the inlet line makes no
> difference, cold or hot.  I have to hold the throttle open for awhile cold. 

You could try a couple of drops of oil down its inlet as a start, but if it's 
completely stuck I wouldn't expect that to help.  

It sounds like it's stuck closed. I'd recommend just pulling the whole assembly 
off the case (remove one nut and the temp sensor.) If you pry it up gently you 
can save the gasket that's under it. Once you have access to the underside you 
can turn it gently and examine everything if you want to, but it may only need 
a bit of motion to break it loose.

If you take it apart, sketch what it looks like as it comes apart as there is 
more than one way to put it back together, and some of them don't work right.

There is a screw and an adjustmen on the underside. It's possible that it has 
been "adjusted" so that it never opens, and I suppose it's also possible that 
the screw is missing so that it just doesn't move at all any more. If that's 
the problem, you can remove the screw. If the screw hole is stripped, you can 
rotate ALL the parts, except the body, 180 deg and tap the hole in the other 

The body has sintered bearings pressed into it. If they are loose, they can be 
put back into place with Loctite.  

> Can the little cover held on with two flat-head screws
> be removed safely?

Yes, but that end is not very helpful. You can try it if you like, but make a 
sketch of things as they come apart.

> There's also no cold-start valve present, and the
> manual hints it wasn't always fitted.  Not really a
> problem here in NoCal unless I go up to Tahoe or
> something.

In '68-9 some cars got it and some didn't. I don't know how it was decided who 
got this option. The '68-9 CSV was a whole bunch of ad hoc add-ons which, at 
least in my mind, serve only to point out the elegance and simplicity of the 
'70-3 CSV. I liken it to the '68-9 master cylinder with the abortive failure 
sense switch. 

Interesting that those 2 bad designs coincide in time. I wonder if VW had made 
a hiring error in their electrical engineering staff/management in '66 or '67?

I'd never looked before, but I just found this entry in the M codes:

      F  318 000 001-- 319 500 000                      M236:

M 236 is the FI. I'll have to check to see if the word "seat" appears there 
because of a typo on my part or theirs. Or can someone tell me what this might 
have been meant to mean.

Regardless, you're better off without it, even in a much colder region than 
you'll ever find in CA.

Jim Adney
Madison, WI 53711-3054

List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org

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