1999.5 Pathfinder auto-climate control whirring

I recently purchased a 199.5 Pathfinder (58K). It has the auto-climate control feature. When the climate control is on -- at any speed or mode
-- there is a somewhat soft whirring/clicking noise comming from what seems like the inside of the passenger-side dash. When the climate system is off there is no noise. Any ideas what might cause this, or what the fix would be?
Thanks.
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rshawkeyes wrote:

Thats the blower motor - does the noise change if you manually change the fan speed?
Nirav
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