Well unless they are serious about weight removal, I would tend to think not. Its a lot of labor to remove a heater core. If your concerned about yours you can check to see if you have two vertical holes on the passenger side of the firewall in the engine bay. If you see two short metal pipe ends sticking out of them, then the heater core is still there. If you don't see them, chances are it isn't. But usually the heater core is still hooked up unless its leaking. Do you currently get heat from the vents? Are you looking to replace it? What are you planning on doing?
2000 Mustang GT-Former giggle gas addict
1990 Mustang GT w/ Vortech V3
***resident gun idiot***