Intake manifold gasket 1998 GMC C1500 350 Vortex

1998 GMC 1500How do you change the intake manifold gaskets? I can smell antifreeze but I can’t see anything leaking on the ground. My brother in-law has the same problem, and he had his checked out and they said the vortex motors were coming for that. I’d like to know how to do this on my own if I can thank you!

Intake Manifold Gasket Replacement