I agree with Klaus...also many people are drilling small holes from under the car, into the pump as a preventative measure...when the check valve (SAS) doesn't do it's job, it lets in condensation that gets stored as water at the bottom of the air pump and there is no escape for it. I think it's a good idea...if you hear a "whirl" sound in the morning when it's cold, then the pump is most likely already full of water and this has affected the bearings in the pump.
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1998 S70 T5 Emarald Green Metallic, 2004 V70 2.5T Ruby Red, Previous Owner of Black '94 850 Turbo Wagon. My cars have been running so well lately they've got me worried.