Rusty,

In my area, the auto salvage yards don't remove them, you have to pull them from the car yourself. The disadvantage of this is that you have to do the work, the *advantage* is that you can be careful, and be assured that there is less damage to the core.

 

Ask for the section with full sized GM cars from the 80's and early 90's.

 

Stand in front of the vehicle with the hood open. In the left corner, near the firewall, there will be a Black plastic cover, often having a blower motor as part of it.  When you remove that cover, the core is exposed and is available to be pulled out. Doesn't take very long, but do it before the weather gets cold.

 

I think the GM cars had one or two suppliers each year, and used the same core for all full sized vehicles.

Bill Schertz