Quote:
Originally Posted by Piotrsko
on an aircooled clean air engine, the thermostats flappers were known to stick shut and trash an engine. It's really hard to find one with working parts. It is also difficult to say if the directed air favored anything since they closed sideways. The best ones came off the early single ports and were installed on the cooling fan input
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See, I know people that are going to disagree. Some say the flaps would always fail open. All I know is I had +40-year-old flaps and thermostat on my Beetle and they never failed in the short time I owned the car.