My laptop (sony vaio VGN-CS325J) fan makes a horrible noise

Part is MCF-523PAM05 and should be replaced

This means that the micro ball-bearings are on their way out if the bearing race smashes then the fan will stop I suggest sourcing a brand new fan and fitting it yourself you might need a star drive look at the profile head of the screws.

http://www.fixya.com/support/r4730725-type_tamperproof_screw_tp3_torx_tri_wing

Make sure that both the mains supply and battery are removed, the fan will be a simple push to clip connection with only 2 wires.

I can usually give a link to a Service Manual, (Free), jacobjos, but no such animal this time.

Instead I'll give you VIDEO's, lol!

1) http://www.youtube.com/watch?v=LelEfSg_JiU

2) Something you may want to look at before you replace the fan,

http://www.youtube.com/watch?v=CxAP8EwGFlQ&feature=related

Install the Synaptics® Pointing Device Drive, VAIO Control Center Software, VAIO® Launcher Software, Setting Utility Series and VAIO® Event Service.

http://esupport.sony.com/US/perl/swu-download.pl?mdl=VGNCS220J&upd_id=5122&os_id=48
restart the Computer.
http://esupport.sony.com/US/perl/swu-download.pl?mdl=VGNCS220J&upd_id=5008&os_id=48
restart the Computer.
http://esupport.sony.com/US/perl/swu-download.pl?mdl=VGNCS220J&upd_id=5078&os_id=48
restart the Computer.
http://esupport.sony.com/US/perl/swu-download.pl?mdl=VGNCS220J&upd_id=5000&os_id=48
restart the Computer.
http://esupport.sony.com/US/perl/swu-download.pl?mdl=VGNCS220J&upd_id=5021&os_id=48

That is the fan making noise if it is under warranty take to a sony service centre otherwise it is not a difficult job to replace you just need to take out all screws on bottom making sure you note where each goes as there are different types,then fan assy is held in by 6 screws and 1 connector.

The fan makes noise in high preformance windows like windows vista&7. So it is normal, because the windows uses motherboard,ram and graphics card with high preformance so they get hotter, so the fan get stronger to cool them or they will be damaged.
This noise also exist in windows xp, but only when opening high graphics game, or being working with the laptop for along time.

the noise might be coming from the fan.. call sony and check if your unit is eligible for fan replacement

2397687669

The sony VGN-S460 seems to have an inherent problem with their cpu fans. It is apparent that the fan uses a ball bearing system which over time becomes worn and causes the grinding sound.

The only solution is to replace the entire fan assembly as they are inseparable.

take it to an expert... the fan is faulty

Check this buddy..