Can anyone tell me if the 90 420sel should have heat coming from the center vents? AC blows great through these vents, but this morning I had to turn a little heat on and the air through those center vents stopped once the heat was turned on. I am thinking the heat is supposed to blow in the side, defrost, and floor. Scott

You're right. You can't/shouldn't get heat from the center vents. You'll have to get a W140 to defrost your inside ear

Sixto
95 S420
91 300SE
87 300SDL
83 300SD