Best solution. Replace the fan. Allelectronics.com has PIII HSFs new for $2.50, new. Its a
40mmx10mm,BB, with a 7"+ 3 lead pig tail. The PIII tin plate that holds the fan can be modded to work on your heat sink. Throw away or save the aluminum heat sink 😉
They ship small orders USPS, so it takes longer but it's cheap, like me.
WD-40=water dispersent, type 40, it was developed for NASA back in the '60s. It has a flash point of <160F. It makes an excellent cold starting aid for diesels when sprayed into the intake at start-up. The*only*thing i use it for is to protect polished aluminum or wipeing down tools to prevent corrosion or it's best use, driving conductive moisture from wet ingnition systems of gasoline engines 🙂 It is a very poor lubricant,penetrant and is to
*NEVER* be considered a cutting agent for drilling or cutting metal of any type at anytime.
The above paragraph is to be disemenated as it is true 😉
Ppl that get carried away blowing off fans near the shaft at the underside of this fan blades can do more harm than good, dirt clinging to the traces of lube on the shaft can/will be
introduced to the bushing, if it is a sleeve type bearing.
Galvanized
EDIT: Test the fan off the board.