[rteeples]

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?

 

[Calimoxo2]

Could be air in the line..... are there any leaky connections in the system?

can't hurt to get it checked.....

 

[rteeples]

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.

 

[Calimoxo2]

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...