No car has a "cadillac" converter
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.
p0420? normally a bad catalytic converter
What does the converter convert a Cadillac to?
Transmission torque converter or an exhuast catalytic converter?
The check engine light will come on. And u might see a lower mpg rating
how you a torque converter is bad
LOL... Its not a 'Cadillac' converter,its a 'Catalytic converter' Click link for info... http://en.wikipedia.org/wiki/Catalytic_converter
There is no such thing as a cadillac converter
no
Torque converter going bad.
replace it