Noisy Engine Fans?

[Lizzi]

Hi all.

Had my 2005 2ltr petrol Avensis for 3 months now. (41k mileage). I've noticed as the weather has warmed up, that once the car is at running temperature, if I get stuck for a few minutes in stationery or slow moving traffic the fans kick in to cool the engine. Thats obviously fine - but they seem really, really noisy. Its noticable even with the windows closed.- Sounds like the engine of a plane starting up! The temperature gauge stays smack in the middle of the readout, and the coolant level is at the max, so I can't see that there could be a problem; I've just never had a car with such noisy and noticable fans before. Has anyone else noticed this? Is it normal??!

Thanks for your help.

[cmia]

Maybe the fans are vibrating.

With the engine off, look down at the fans any cables touching or plastic parts loose?