I've been having this strange low sort of random "rattlebox" noise that seems to come from the passenger side of my '05 T&C. I've got just over 100,000 miles on the vehicle. It strangely sounds like a valve lifter noise, but the oil is checked, changed, etc. The noise won't always happen, but if it does it happens when I'm just going slow around a parking lot. If I speed up it fades, and it's relatively low. If I have the radio on I can't hear it. Any idea what this could be? Thanks a bunch. I've been trying to track this down for the past 10,000 miles or so!

 

anyone have an idea on this? I still can't figure out where the noise is coming from. I don't think it is suspension since I had the front struts replaced not long ago for a different noise. This one seems to be a "running" type of noise coming from something in the engine bay.

 

Sounds like the AC compressor, located below the alterntor at front passenger side.