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It would be preferable to replace it, of course...but it isn't really required if you're just careful. You would need to contact HP direct in order to TRY to get the part...they generally won't sell repair parts to individuals, but only to authorized repair centers.
For cleaning the clogged cooler simply try to blow from outside-in with some air canister. General instructions: Big work if you are unfamiliar. Remove the battery, all little covers and all the screws from underside, if the underside cower can not be removed, then maybe you must remove the motherboard. Try to remove the keyboard, keypad and everything from upper side until reach fan... Do not use brute force. Remember the position of long screws, if any.Also remember the route of the cables.Mark the position of inner screws on board with some red marker, this helps a lot. Use electrostatic protection (recommended). If you remove any cooler, after cleaning you must use thermal conducting paste. After removing the fan, if no other , try lubricating the fan rod (under the fan label) with a little thermally resistant grease. God work !!!
The heatsink is obviously clogged with dust, adding the extra cooling like you have has helped but the build up of dust has obviously now become critical. You can try blowing compressed air into the proccessor/heatsink vents in the back of the case but the best answer is going to to open the case and physically brush/blow the heatsink clean.
If you feel confident enough to open the case, this site can help you with some pointers: http://www.irisvista.com/tech/