What Not To Do When Fixing Your Toyota Prius AC Has your Toyota Prius quit cooling? If so, and you want to fix it yourself, here are a couple of tips to avoid a larger cost repair. Advertisement Summer is pretty much here, and you all know what that means. Time to crank up the AC and chill out while driving. Though the AC may not blow cold for some of you, on a Prius, that usually means a refrigerant leak. Before you head out to the local auto parts store, let me give you some information to help you make an informed decision on what to buy.