Sorry for not being clear.
In 2003 there were 3 model lines for Elantra
Gl
VE
GT
The GL was the stripper, 2.0, CD, two keys and an ashtray
VE added PW, PL, PM, Cruise, and AC.
The GT was the 5 door, and came loaded, with options for Sunroof, Leather, ABS and TC. GT model came with different suspension settings, and 4 wheel disc brakes, alloy wheels, upgraded guages (purple, included trip computer for mileage, distance to empty etc)
So, If your friend's friend had a dealer install the AC, it had to be a GL model. The VE and GT models it came that way from the factory. If the '03 model you are looking at is a VE, don't worry about the AC, it was a factory, not a dealer installed item.