My 2002 TC with only 42K miles recently started making noises while in idele at the traffic lights.
Tach shows stable RPM and I can feel vibration and low frequency noises.

As soon as I star movement I can't feel it anymore.

Any ideas what should I check before taking it to the mechanic?

Thanks

 

I had a similar situation with my 2005 T&C with 110K miles. The alternator's bearings and clutch began to go out causing a low frequency rumbling noise that I only heard at idle. Sounded like a cat purring...a big cat! I had the alternator rebuilt and all is quiet now. My mechanic said it was on the verge of coming all to pieces.