Ford Focus 2001 1.6 Zetec - Ford Focus heater - squeak - yot981j

Hello,

The heater on my car is working fine but within the last few days it has developed abit of an annoying squeak, most noticable when it is on speed setting 1.

Any ideas what might be causing the noise and how to stop it - otherthan not use the heater ;-)

Thanks, Jon