What are the normal high and low side air conditioning pressures for a 1998 Cadillac Catera with a 3.0 engine?

It depends on the RPM at Idle speed your low side apr.. 40

and High side at about 150 at 2000 RPM LOW 22 High 230

if high is over 250 there is to much 134A in system at a

amibent temp. of 70 degrees F. RPM and outside temp effects