1997 Cadillac STS water crossover manifold

I have had problems with over heating found bad radiator replaced it done a presure test good ran it at a ideal with presure tester on it not much more presure so ruled out head gasket. On a cold morning found steam on driver's side and looked like it was coming from water crossover manifold near the back side nearest the fire wall. Steam was coming up from under air intake near the bottom near head or block. How do I get to the bolt with all of the wireing harness in the way and do I need to disable any safety plug in so has not to deploy the air bags. Has this problem happen to very many people with northstar engines. Thank you Kenny