Rebuild AAV- bulb source

[sbobev (Steve)]

Behr TX 103 30 bulb was found from which LOOKS correct for the application and specs out as a 30 degree C (86F) opening temp

You’ve search well :-))

They are indeed the same, here is the post-mortem

Auxiliary Air Valve (AAV) disassembly and rebuild guide

Bulb is the same. I have seen 3 of the 4 different part numbers. Also, as discussed in a different thread, the bulb is a Mercedes/Bosch design used in millions MB (and BMW cars). Apparently the MB guys knew it before we, the JAG community figured it out: [AAVbulb] Post #7 from July 2010 here: https://www.benzworld.org/forums/r-c107-sl-slc-class/1533174-auxilliary-air-slide-valve-deconstructed.html#post4253249 Kirby’s Book was cited in their forum. Well done!

The other generic part number to find the bulb is W0133-1630030.
Or, the one used by MB 0012039575

Good luck, opening the AAV is fun project