2000 Sebring 2.4L Radiator Drain Petcock Replacement

I flushed the radiator and now, when I close the drain petcock, it leaks. Can the petcock be changed with the radiator still in the car or is this gong to turn into another 3 day project? Any idea what the process is to change one of these things?

The drain plug came out but with great difficulty. You need to turn the plug 90 degrees and then pull straight out. Don't pry it out. There is a small shoulder around the outside of the plug. I broke mine but thankfully there is no leak. When replacing the plug, lube it up, I used some silicone, pushed in and turned. All is good. Thanks,,