Forget what everyone else said. They don't know what they are talking about. Your problem is obviously STARVATION!
Yep, that's right. STARVATION!
How long has it been since you fed the squirrle that powers the fan? If he doesn't have any food then how do you expect him to run inside of his cage? I suggest you buy some squirrle food from the pet store and drop it into the air plenum through your uppermost vent. Give it a day or two and see if he gets better. You might want to pour some water down the vent too. Just incase he is thirsty. 
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"Some men are Baptists, others Catholics. My father was an OLDSMOBILE man." Ralphie Billingsley A Christmas Story 1983
"We rei-eign, supreme, ooooh god! Burrito supreme, and a chicken supreme, and a CUTLASS SUPREME!" Tenacious D 2007
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