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Discussion Starter · #1 ·
Have an '01 Pathfinder (my third) and started sometimes getting a weird noise when I turn on the AC. It gets louder as I accelerate. It's not super loud, just audible enough to be annoying.

It sounds kind of like a refrigerator rattle. Only does it sometimes. Anyone had a similar experience?
 

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Discussion Starter · #3 ·
No leaks that I can see.

It's odd, but I can't hear the noise at all from the engine when the hood is open. I can only hear it in the cab. It sounds almost like it's coming from behind the glove box or center of the dash.
 

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The evaporator is usually behind the glove box where you could potentially have air trapped (it looks like a little radiator)....

Your system should be R134..it is usually fairly cheap to get it topped off at any gas station with a service bay....they will evacuate any air while they fill it up with freon...
 
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