Looks like I can rule out the thermostat
One interesting tidbit though, when I pried off the thermostat (after removing the upper radiator hose) I could hear it sucking in air, showing me there was a vacuum underneath the thermostat
Isn't there usually a bleed hole in those things ?
For now, I've installed the housing without a thermostat and after the silicone cures overnight
And then we'll see how it does
Any thoughts on that vacuum though?
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