Let me tell you how my 103 fan on my '91 300SE has behaved for the last 20 years.

- I just went out into the 72-degree garage (Rowlett, Tx) and spun the cold fan by hand. It turned maybe 3/4 turn, about 1/2 second, and stopped.
- When the engine is cranked and warmed up to normal temp (85 C) then stopped, the fan can be spun by hand and will turn several revolutions before it stops. It's quite loose at this temp, and will not roar at all when the engine is revv'd.
- Under very hot conditions, when the outside temp is pushing 100, you can occasionally hear the fan roar under initial acceleration, but the roar subsides by the time the car reaches 20 MPH, and is not heard again unless I sit for awhile at a light.

DG