Re: Are Sierra thermostats OK?

[Don]

Not to worry amuller, we are usually just looking for an excuse to be cranky!
I’m not sure just what you are asking about the ebay thermostat cover…So, please re-ask your question….In any event, the early style thermostat cover was designed way before the overboard indicators/pee-holes were introduced late in the 70s. So, I’m thinking whatever the blank passage you are referring to is just part of the manufacturing process.
I too feel that most thermostats need a bit of a bleed to make sure the block is not air bound until the thermostat somehow opens….I will have to look at one of the new BRP SS thermostats when I get home…