Update for la famiglia: la ZHPess is back on the road; the engine is now silky-smooth. That improvement is largely because I remembered one ‘minor’ detail; notably, I’d unbolted the S/C from the block in preparation to remove it so I could access the starter from above. Once I eliminated the pressure leak THAT caused, everything else fell into place. The Zionsville mechanical thermostat seems to be working as hoped; the cabin takes a minute or two longer to warm up on wintry Wisconsin days, but that’s a small price to pay for increased thermostat reliability!


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