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zerohour: Olympiadis posted a good diagram the thermac.
I'm quite sure you can find one in a junk yard. It is built into the air filter housing intake. Look for a 1988 - 1996 GM vehicle. Other makes/years have it but this is what I am familiar with. I also know the yards are full of these cars. Just unscrew the wing nut, remove the cover and pop the housing off. Grab the preheater hose at the same time. It is the flex hose extending down from the air intake. It slides right off the exhaust manifold cowling. At home, hacksaw the intake (snorkel) off the filter housing and you have the thermal mechanism you need.
I suggest the wax actuator due to it's simplicity but you will not have the control available if electrical or vacuum operated. Mine works fine and is 20 years old with 171.00 miles of use including plenty of PA winters. I feel a device like this does not warrant user intervention.
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