New to site and need help on removing all ac parts, replaced compressor but have a leak and was told to replace the evap. Any ideas. it looks like it's part of the van. Thanks Ron

Welcome to AF, start with posting the year make and model, and a better description of what you want to do.

1991 GMC VAN I need to revome all ac parts.

Again, from where, under the hood, in the vehicle under the dash?

Your just going to throw parts at it? Did you see for sure it was the evaporator? Did you put dye in the system? there are plenty of lines and connections to check and the low side valve is good for leaking after you remove your gauges.