One problem related to manifold/header/muffler/tail pipe has been reported for the 2000 Cadillac Deville. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2000 Cadillac Deville based on all problems reported for the 2000 Deville.
"check coolant" light, overheating, taken to garage "free lance" Cadillac mechanic researched problem that it is a factory related incident that the first owner of the car ignored and should have been sent back to gm and they would have fixed it. I am a second owner to car and I have "inherited" this problem. Blown head gasket. . . . . . . . . . . . You pour coolant in and it runs right out the tail pipes!.