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That’s a sign the fluid isn’t flowing. With thermostat open, both should be pretty hot at that point.

I had something like this happen to me when I exchanged my coolant. You could have an air pocket in the system or could be a failed thermostat. When it gets up to temp, feel the upper and lower hoses - if they’re not equally hot - that can indicate your thermostat may not be doing it’s job. You...