One thing I've always noticed about my PowerBook G4 - only one fan seems to work.

my pb, 15" 1.67 hi res model, in disarray battery not charging, has had it's ups , downs on years. 1 thing i've noticed since got in late 2007 fact can hear 1 fan spinning in times of hotness. when first pulled thing apart repair in it, discovered has 2 fans.

1 on left (left in @ keyboard) spins , makes signature whirring sound, don't think i've ever heard 1 on right making noise @ all. i've stuck ear vent on of powerbook when it's been running hot and, while can hear airflow left hand fan can't right.

that's not right hand fan isn't running @ of course, whisper quiet , 1 on left 1 ever gets powered right make noise (the case seem bit hotter on left right). wonder though if i've got dud fan in it.

has else here has 1 of these pb's ever noticed same thing or can can hear both fans powered when system get's hot? if end having fix dc board rectify battery charging issues figure might fix fan if broken, might make system cooler in future , make components dc board , mac overall last me lot longer.

 

i think second fan comes on during extreme temperatures. have 2 17" powerbooks, both 2 fans. have heard second fan come once or twice on 1.67ghz. @ time mac on couch during summer , processor pegged @ 100% cpu hour or so. temps in excess of 130 degrees not normal pb operates around 100-118 (118 being first fan kick in).

1ghz mac i've heard second fan come on once. again, in extreme temp condition. mac operates between 130 140 degrees , first fan kicks on @ 140. high cpu loads though first fan has been able kick temp down 132 or so.

might getting istat menus. it's got fan option , can see rpms fans doing.

 

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