93 Caravan 3.3 A/C

I just getting prepared. My air went out the other day, maybe low of r134a,
but that means there's a leak or hopefully a switch is not working. I
jumpered the switch at the H-valve by the firewall and the compressor does
come on, so I think that's good. But -- if it's the front evaporator, I
hear it's a big job. Is it big because you need to take the front lower
dash off and that's a long process or because it's difficult to do for some
reason. Like I said, just trying to get all the facts in case I need to
replace the evaporator.

thanks,
ncs