Thanks will look for the unlock process and check the temperature changes.

The frequency seems significantly higher; it almost feels like the threshold on which the fan is being activated now is lower than before I changed the thermostat.

If this is the behavior under light traffic and Fall temperatures outside, I'm afraid that under a summer heat wave, A/C on and true gridlock (full stop) could stress the system way over.....

As a side note, I have an e60, which has an electric fan as well and it rarely goes off.