Concern: Compressor makes a rattling / rumbling noise, usually just after a start up.

Cause: Broken / collapsed compressor vibration isolation grommets.

Correction: FoMoCo won't sell just the grommets, but they will sell you a new
compressor for about $400+ dollars. The Lord co. makes a replacement
grommet under part number J-2927-4-2 , Western Rubber and Supply
distributes them under part number LO-180-0457 , there phone number is
1-800-969-0998. Vehicles affected are '03 thru'11 Town cars and possibly older.
About a thirty minute repair.

Hope you find this usefull.