Thank you both.....

Yes, I meant the fan on the left as you are facing the engine compartment.
I take it from your explanation that this is the radiator fan?

Perhaps, I need to check the coolant level as well.

I will do that this morning.

Another question......recently I had a significant vibration in the front
end when decellerating. I checked the front rotors and they had excessive
wear, so I replaced them and the pad. The vibration is still there. What
might cause this?