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2015 Nissan Pathfinder - HVAC issues

In the last year the blower for ac and heat works only when it wants to…you can hear it blowing but nothing comes ouut the vents…some days , works fine, next day, nothing

Since you can hear the blower chances are a failing blend door actuator. Some are easy to get to and relatively cheap to repair/replace, others difficult therefore more expensive.
Could be your cabin air filter, if equipped, but doubtful in as much as lack of air flow should be consistent.

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Thank you for the info…a mechanic mentioned the cabin air filter so my son changed it, no change…but we will look in to the blend door actuator…thanks again