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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 ? Try My Yahoo! http://my.yahoo.com