Goodman CK36-18 problem
Are you sure the fan isn't working, or is it just iced up? A freeze up can cause complete blockage of the duct system, which results in no air flow.
If you can get to the air handler, take the panels off to see if the blower is running (be sure the tstat is set to call for cooling, or just turn the Fan switch to ON). Be careful in the air handler - there's high voltage and moving parts, so don't poke around in there.
If the blower is running, then do you see any ice? If so, turn the system to OFF, and the fan to ON, and leave it that way for a few hours. If the filter is dirty, change that.
Otherwise, you'll need to call someone out to diagnose the issue.