You're right, the fan is no good. Luckily it's night and temps will be rapidly going down. The best thing to do is get some empty soda bottles and fill about 80% with water and freeze them. Of course, it's going to take some time for that to occur so if you have something else in the freezer you can wrap in fabric and put in the cage, go ahead and do that now. Make sure they are totally out of the sun. Find the coolest part of the house and move the pigs there. If you have any ceramic tiles or bricks sometimes the pigs will pancake out on those to cool off. My boys will even eat ice cubes. It's going to be imparitive you keep them cool. 85F is about as warm as they can tolerate.