Winter is Coming
Time to think about winterizing your Bolt.
A good Tech Tip WINTERIZING YOUR TRUCK including a link back to the Forums for additional tips.
I found the "dual action" thermostat housing from one of the members here. I picked up the bypass thermostat that fits at a local parts store. As 4onthefloor said earlier, your best bet would be an old 2-ton truck or a school bus.