I am assuming that you want to know where the Catalytic converter is in your 1990 Cadillac.
it is underneath the car, silver color (or rust) welded to the exhaust pipe about the center of the front seat floor.
What does the converter convert a Cadillac to?
1800oldjunk
No car has a "cadillac" converter
1990 was the last year Chevrolet made Celebrities. If you mean catalytic converter they look like a muffler, some have bolt on flanges.
Torque converter going bad.
LOL... Its not a 'Cadillac' converter,its a 'Catalytic converter' Click link for info... http://en.wikipedia.org/wiki/Catalytic_converter
Assuming you mean Catalytic Converter, your local auto parts store should be able to get you either a bolt in type or a weld in type.
There is no such thing as a cadillac converter
no
One can find deals on Cadillac Escalades from the following sites; Cadillac Europe, AutoTrader, Aol Autos, CarsDirect, and Since 1990 Exclusive Cars.
replace it
A Cadillac converter is a piece of your vehicles exhaust system that helps reduce toxins to our environment. It is a very important piece to your vehicle and our earth.