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hello,,RAY,, i have open the auxiliary valve on my ( 412-73,,1.7 ) and he has nothing for to cut the power on the heather,,( no micro-swith inside ) it is connected on the pump realy,, and he heat all the time ,, we d,t can keep this heather for long time,, i have look the ,,, trotle body valve ,, on the audi or vw,, pn ,035-133-455f this valve is ,,normal close ,, if we use a small bi-métal thermostat in sérial with this valve ,,wend the motor is hot the thermostat cut the power on this valve and close the hose,, excepted we d,t have the variation with the temp ,, like the 412 original,, it is full open or full close,, but the life for this valve is very long,, i know some 412 fan change the heather inside of the original valve with the porcelaine heathing résistance,, but we have the same problem ,afther couple of years , he burn again,the heather heat all the time,, what do you thing of my idea,,, ??? albert

Albert...I have had in my collection.....for some time now.....a collection of some of the strangest auxiliary air regulators I have ever seen. I have a bout 30 of them brand new in the box. They are all Bosch.
They were desigend for watercooled cars...Citroen, Renault, Mercedes...who knows.
But...They are beautifully made...and all have copper or brass bulbs on the bottom designed to plug into the water jacket. Most are stamped with 60-65C (about 150F) on teh bulb. They are rotary valves just like the one on the type 4. I have not tried any yet. I'm figuring they could be placed somewhere warm and work well. Any thoughts? I can send you a picture of several in e-mail tommorrow. You are welcome to psot them. Ray