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<x-charset UTF-8>I believe this is what tou have: http://www.tiserves.com/VW/technical/FI/page42.html I think you should be able to test it by gently warming it. I test car thermostats by immersing then in hot water with a thermometer and monitor their opening. I presume these can be tested similarly (and you would only need 122 deg water, which you may even get out of your tap. Temp sensor II (not the head temp sensor) was always air. It measures the temp of intake air. On Tue, 15 Feb 2005 20:44:40 -0800 (PST), James Montebello <lapuwali@yahoo.com> 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. > > 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. > > Can the little cover held on with two flat-head screws > be removed safely? What am I likely to find in there? > I assume this uses oil temp to open and close? Does > "temp sensor II" also measure oil temp (not air temp, > as the later cars do)? > > 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. > > --- Jim Adney <jadney@vwtype3.org> wrote: > > > 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 > > ******************************* > > > > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > List info at http://www.vwtype3.org/list | > > mailto:gregm@vwtype3.org > > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > > > > > > __________________________________ > Do you Yahoo!? > All your favorites on one personal page â Try My Yahoo! > http://my.yahoo.com > > </x-charset>