Well mines been squeaking like a banshee wailer since I bought the car. Been driving me up the wall... especially when wanting to use air con. But I have never wanted to spend £300 on a new one (supllied - not fitted).
I was just having a look at the pollen filter tonight and cleaning out the moisture shute and when I took out the pollen filter I saw the heater motor is right near the openning. I was able to lift the fan up about 3mm with a long screw driver in my left hand and stick my WD40 (using the small can which will go in openning) straw in the gap. I pumped in some oil and worked the fan round and hey presto!!... silent fan.
Happy days :O)