Has anyone had problems with their car overheating after their A/C has been fixed?

So, I haven't been using my A/C a a year or so, but since it's hot this year I've decided to
send it to the shop to fix my A/C. They tested out for a bit to show me that the A/C
works, but when I drove it to the freeway, my car started to overheat. I open the hood,
and my coolant was leaking. Has anyone had the same experience as I have? Is there
anything else I should check? My car was working fine all this time till I decided to fix my
A/C, and now it doesn't want to work at all!