I've got it! I've got a scenario whereby changing the spark plugs can lower the coolant temp!
Work with me here:
When you jacked up the rear of the car to gain access to the motor, the little peice of cardboard that was partially blocking one of your radiators, fell into a different position, which is no longer blocking airflow.
I think this is MUCH more plausible than what you've been postulating.
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