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thermostat small vent hole,on top or bottom?

(1990 BMW 750iL)
in West Palm Beach, FL on February 23, 2011
the correct position of the thermostat
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on February 23, 2011
Put the spring side of the thermostat towards the engine, that will be the correct way to install it.

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on February 23, 2011
Put the spring side of the thermostat towards the engine, that will be the correct way to install it.

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