Quote:
Originally Posted by tangofox007
There is a passage in the housing just outside the perimeter of the thermostat flange. (That's why there is a small hole in the thermostat gasket.)
Not saying that they never existed, but I have never encountered a OM617 thermostat that featured a vent hole. If one was so equipped, it would be redundant.
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I've also never seen one with an actual vent hole hence the initial question about weather orientation mattered on the OM617... Thanks to everyone for shedding some light on this and being very helpful and answering my questions!
