Auxiliary Air Valve
From: Rick Lindsay (rolindsayyahoo.com)
Date: Wed, 31 Dec 2008 13:23:08 -0800 (PST)
Here are the pictures I promised.

Here is the Auxiliary Air Valve mounted on the coolant expansion tank, 
http://www.aubard.us/Mondial/HPIM1316.JPG .  These next two pictures are of the 
valve removed from the car and on the bench, 
http://www.aubard.us/Mondial/HPIM1337.JPG and 
http://www.aubard.us/Mondial/HPIM1338.JPG .

After cleaning up the unit with brake cleaner it looks like this, 
http://www.aubard.us/Mondial/HPIM1342.JPG and 
http://www.aubard.us/Mondial/HPIM1344.JPG .  In the first picture you can see a 
little oil remaining near the nut.  These kinds of pictures are good for 
spotting details.  The inside of the valve is still rather oily, even after 
cleaning.

At ambient temperature of almost 60 degrees F, about 20% of the port is open, 
http://www.aubard.us/Mondial/HPIM1340.JPG , as is seen in this image.  After 
applying control voltage for about 1 minute, the port closes completely, 
http://www.aubard.us/Mondial/HPIM1343.JPG .  And in this picture you can see 
not only the closed port but also the Bosch part number, 
http://www.aubard.us/Mondial/HPIM1341.JPG - and oily residue still inside.

I have since placed the AAV in the freezer at about 25 degrees F, for more than 
an hour.  The diaphragm should be 100% open - and it isn't.  Here's how it 
looks at 25 degrees F, http://www.aubard.us/Mondial/HPIM1346.JPG .  Its open no 
more so than at 59 degrees F!

My guess is that before I cleaned up the valve, the diaphragm didn't move at 
all.  I'll continue to clean and flush away the oily debris inside thereby 
hopefully freeing the movement to open fully.  If it will not do so, a new AAV 
will be in my future.

regards,

Rick

Results generated by Tiger Technologies Web hosting using MHonArc.