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I've always used a pan of boiling water to check them, of course they have to be out. I do the same with water-cooled engine thermostats. Usually the cooling-flap one grows to about fill the bracket space in boiling water, not sure of mm/degree change, though. I'm sure there's a spec somewhere, but if it moves, it's probably OK. On Thu, 25 Mar 1999 10:01:19 -0800, you wrote: >Does anyone have an understanding of the dimensional changes I should see on the >bellows from room temperature to "operating temperature"?. My car has three: >One up near the push rod tubes for engine cooling, and one in each heater duct >for fresh air introduction to the cabin heat air stream. A hair dryer doesn't >generate the kind of temperature swing to make them "grow" significantly. Your >thoughts/experiences please. > >Dave Timmins > >'70 Square >'89 Cabrio ------------------------------------------------------------------- Search old messages on the Web! Visit http://www.vwtype3.org/list/