Inspiron 4000 Part Number

[squeech]

Greetings all,

I am working on an Inspiron 4000 for a customer, and I need to replace his CPU fan. However, there is no part number on the apparatus...making it difficult to order another one. Dell is not being very cooperative either. So my question is:

Does anyone know the part number for a Dell Inspiron 4000 CPU cooler fan? Or perhaps a resource where I could find that out?

I have the service tag and s/n of the unit if any of you are so inclined to need it.

TIA,

[squeech]

^ ^...plz