Searching through the forum I've seen previous discussion on the similar issue, but there was no definitive conclusion as to the actual cause. When I turn off the engine, I noticed that the radiator fan immediately kicked in. It was not on when the engine was running. I turned the ignition to ON (but not starting the engine) to check on the water temperature, and it was somewhat elevated (slightly above 50%). With the ignition in the ON position, the radiator fan stopped. A soon as the ignition is returned to the OFF position, the fan kicks in again.

This doesn't happen all the time... only about 2 or 3 times out of 10. But I guess whatever it is, it's going to get worse.

Is this a problem with the relay or the thermostat?